{ "bbox": [ -71.27, 42.18, -70.98, 42.47 ], "center": [ -71.06, 42.355 ], "country": "United States", "defaultZoom": 10.3, "homeCurrency": "USD", "id": "boston", "lines": [ { "cityId": "boston", "color": "#DA291C", "displayNumber": "Red", "id": "boston-line-Red", "name": { "en": "Red Line" }, "phases": [ { "confidence": "medium", "constructionStart": "1909", "geometryRef": "boston-Red", "id": "boston-red-1912", "kind": "initial", "label": { "en": "Cambridge subway opens: Harvard → Park Street (initial line)" }, "notes": "Opened by Boston Elevated Railway as the Cambridge tunnel (later the Cambridge–Dorchester line, renamed Red Line in 1965). 4 stations: Harvard, Central, Kendall, Park Street. No reliable construction cost figure located for the original tunnel. [Date chase 2026-06-12] Harvard station article gives a precise start of May 24, 1909 (Cheney 2002), corroborating the curated 1909.", "opened": "1912-03-23", "segment": { "fromStopIndex": 3, "toStopIndex": 7 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260106162341/https://en.wikipedia.org/wiki/Cambridge_Tunnel", "kind": "wikipedia", "quote": "The section from Harvard (and new maintenance facilities at Eliot Yard) to Park Street was opened by the Boston Elevated Railway (BERy) on March 23, 1912.", "tier": "tertiary", "title": "Cambridge Tunnel / Cambridge subway — Wikipedia", "url": "https://en.wikipedia.org/wiki/Cambridge_Tunnel" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611112757/https://en.wikipedia.org/wiki/Cambridge_subway", "kind": "wikipedia", "quote": "The contending groups finally compromised on two intermediate stations, at Central and Kendall Squares, allowing construction to start in 1909.", "tier": "tertiary", "title": "Cambridge subway — Wikipedia", "url": "https://en.wikipedia.org/wiki/Cambridge_subway" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260426022315/https://en.wikipedia.org/wiki/Harvard_station", "kind": "other", "publisher": "Wikipedia", "quote": "Construction began on May 24, 1909.", "tier": "secondary", "title": "Harvard station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Harvard_station", "via": "https://en.wikipedia.org/wiki/Harvard_station" } ], "stationCount": 4 }, { "confidence": "low", "geometryRef": "boston-Red", "id": "boston-red-1915", "kind": "extension", "label": { "en": "Dorchester Tunnel extension opens: Park Street → Washington (Downtown Crossing)" }, "notes": "Southward extension of the Cambridge–Dorchester line via the Dorchester Tunnel to Washington Street station (now Downtown Crossing). Opened April 4, 1915. [Opening-date chase 2026-06-13] Red Line (MBTA) narrative gives the precise revenue-service date April 4, 1915 (curated source quoted only the year).", "opened": "1915-04-04", "segment": { "fromStopIndex": 7, "toStopIndex": 8 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "extended south as the Dorchester Tunnel to Washington in 1915", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "boston-Red", "id": "boston-red-1916", "kind": "extension", "label": { "en": "Dorchester Tunnel extension opens: Washington → South Station" }, "notes": "Extension under downtown Boston to South Station (South Station Under), opened December 3, 1916. [Opening-date chase 2026-06-13] Red Line (MBTA) narrative confirms the precise date December 3, 1916 (curated source quoted only the year).", "opened": "1916-12-03", "segment": { "fromStopIndex": 8, "toStopIndex": 9 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "South Station in 1916", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "boston-Red", "id": "boston-red-1917", "kind": "extension", "label": { "en": "Dorchester Tunnel extension opens: South Station → Broadway" }, "notes": "Extension across the Fort Point Channel to Broadway station in South Boston, opened December 15, 1917. [Opening-date chase 2026-06-13] Red Line (MBTA) narrative confirms precise date December 15, 1917 (curated source quoted only the year).", "opened": "1917-12-15", "segment": { "fromStopIndex": 9, "toStopIndex": 10 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "Broadway in 1917", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "boston-Red", "id": "boston-red-1918", "kind": "extension", "label": { "en": "Dorchester Tunnel extension opens: Broadway → Andrew" }, "notes": "Extension to Andrew station, which served as the southern terminus until the Dorchester (Ashmont) extension opened in 1927. Opened June 29, 1918. [Opening-date chase 2026-06-13] Red Line (MBTA) narrative confirms precise date June 29, 1918 (curated source quoted only the year).", "opened": "1918-06-29", "segment": { "fromStopIndex": 10, "toStopIndex": 11 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "and Andrew in 1918", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "boston-Red#2", "id": "boston-red-1927", "kind": "extension", "label": { "en": "Dorchester (Ashmont) extension opens: Andrew → Fields Corner" }, "notes": "Surface extension along the former Shawmut Branch Railroad right-of-way (acquired 1870). Three new stations added: Columbia (now JFK/UMass), Savin Hill, and Fields Corner. Opened November 5, 1927. [Opening-date chase 2026-06-13] Red Line (MBTA) narrative confirms precise date November 5, 1927 (curated source quoted only the year).", "opened": "1927-11-05", "segment": { "fromStopIndex": 2, "toStopIndex": 4 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "with three additional stops added to Fields Corner in 1927", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 3 }, { "confidence": "medium", "geometryRef": "boston-Red#2", "id": "boston-red-1928", "kind": "extension", "label": { "en": "Dorchester (Ashmont) extension opens: Fields Corner → Ashmont" }, "notes": "Continuation of the Dorchester surface extension to Ashmont (terminal) and Codman Yard. Two new stations added: Shawmut and Ashmont. Opened September 1, 1928. [Opening-date chase 2026-06-13] Revenue-service opening September 1, 1928 corroborated by a contemporary Boston Globe clipping ('Rapid transit extension to Ashmont is opened', Sep 1, 1928, p.12); paywalled but cited via Red Line (MBTA).", "opened": "1928-09-01", "segment": { "from": [ -71.0634234, 42.2839548 ], "to": [ -71.0612761, 42.3001325 ] }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "and two more stops to Ashmont in 1928", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20221119001911/https://www.newspapers.com/clip/56417978/the-boston-globe/", "kind": "news", "publisher": "Boston Globe", "quote": "Rapid transit extension to Ashmont is opened [Boston Globe, September 1, 1928, page 12]", "tier": "secondary", "title": "Rapid transit extension to Ashmont is opened", "url": "https://www.newspapers.com/clip/56417978/the-boston-globe/", "via": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 2 }, { "confidence": "low", "geometryRef": null, "id": "boston-red-1932", "kind": "extension", "label": { "en": "Charles/MGH infill station opens" }, "notes": "Infill station added on the Longfellow Bridge approach (Boston side), between Park Street and Kendall. No new track — single new station on existing line.", "opened": "1932-02-27", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "Charles/MGH station, an infill station, opened on February 27, 1932", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 1 }, { "confidence": "medium", "constructionStart": "1966", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "USD", "isEstimate": true, "value": 5877000, "year": 1971 }, "notes": "Sourced figure is for Quincy Center STATION ALONE ($5.877M), NOT the full three-station South Shore Line extension, for which no total cost figure was located. [Citation chase 2026-06-11] The $5,877,000 figure traces to the 1986 Thomas Crane Library historic/architectural survey of Quincy (p.77), which describes the completed station retrospectively (\"was... constructed by the J. F. White Co.\"), indicating this is the actual built cost of Quincy Center station plus its 900-car garage rather than an estimate; the figure is in nominal 1971 USD.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113152/https://en.wikipedia.org/wiki/Quincy_Center_station", "kind": "wikipedia", "quote": "North Quincy, Wollaston, and Quincy Center stations opened on September 1, 1971.", "tier": "tertiary", "title": "Quincy Center station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Quincy_Center_station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113152/https://en.wikipedia.org/wiki/Quincy_Center_station", "kind": "wikipedia", "quote": "In May 1966, the MBTA began construction on the South Shore Line branch.", "tier": "tertiary", "title": "Quincy Center station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Quincy_Center_station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113152/https://en.wikipedia.org/wiki/Quincy_Center_station", "kind": "wikipedia", "quote": "The $5.877 million station, located a block north of the Old Colony station site, was designed Samuel Glaser Associates and built by J.F. White.", "tier": "tertiary", "title": "Quincy Center station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Quincy_Center_station" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Thomas Crane Public Library, Quincy, Massachusetts", "quote": "The $5,877,000 Quincy Center Station and the five level, 900-car parking garage, which includes a floor of 200 cars just for Quincy shoppers, was designed by Samuel Glaser Associates and constructed by the J. F. White Co.", "tier": "secondary", "title": "Off Hancock Street — Historic and Architectural Survey Quincy, Massachusetts, p. 77 (1986)", "url": "https://web.archive.org/web/20110720204650/http://thomascranelibrary.org/htm/161.htm", "via": "https://en.wikipedia.org/wiki/Quincy_Center_station" } ] }, "geometryRef": "boston-Red", "id": "boston-red-1971", "kind": "extension", "label": { "en": "South Shore Line opens: Columbia (JFK/UMass) → Quincy Center" }, "notes": "First section of the South Shore Line, branching at a flying junction north of Columbia (now JFK/UMass), built along the former Old Colony right-of-way. Three new stations: North Quincy, Wollaston, Quincy Center. Cost figure given is for Quincy Center station only ($5.877M, ~1971), not the whole extension. [Date chase 2026-06-12] Red Line (MBTA) article corroborates 'under construction since 1966', consistent with the Quincy Center 'May 1966' start.", "opened": "1971-09-01", "segment": { "fromStopIndex": 12, "toStopIndex": 14 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113152/https://en.wikipedia.org/wiki/Quincy_Center_station", "kind": "wikipedia", "quote": "North Quincy, Wollaston, and Quincy Center stations opened on September 1, 1971.", "tier": "tertiary", "title": "Quincy Center station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Quincy_Center_station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113152/https://en.wikipedia.org/wiki/Quincy_Center_station", "kind": "wikipedia", "quote": "In May 1966, the MBTA began construction on the South Shore Line branch.", "tier": "tertiary", "title": "Quincy Center station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Quincy_Center_station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113152/https://en.wikipedia.org/wiki/Quincy_Center_station", "kind": "wikipedia", "quote": "The $5.877 million station, located a block north of the Old Colony station site, was designed Samuel Glaser Associates and built by J.F. White.", "tier": "tertiary", "title": "Quincy Center station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Quincy_Center_station" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "other", "publisher": "Wikipedia", "quote": "The first section of the South Shore line, under construction since 1966, opened on September 1, 1971.", "tier": "secondary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "via": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 3 }, { "confidence": "medium", "constructionStart": "1977", "geometryRef": "boston-Red", "id": "boston-red-1980", "kind": "extension", "label": { "en": "South Shore Line extension opens: Quincy Center → Braintree" }, "notes": "Braintree extension of the South Shore Line; Braintree opened March 22, 1980 as terminal. Construction groundbreaking July 13, 1977. The intermediate Quincy Adams infill station opened later (September 10, 1983) due to delays. No total construction cost figure located. [Date chase 2026-06-12] Quincy Center article corroborates 'Further construction began in 1977', matching the Braintree July 13, 1977 groundbreaking.", "opened": "1980-03-22", "segment": { "fromStopIndex": 14, "toStopIndex": 15 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611054021/https://en.wikipedia.org/wiki/Braintree_station_(MBTA)", "kind": "wikipedia", "quote": "The station opened on March 22, 1980, for Red Line service.", "tier": "tertiary", "title": "Braintree station (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Braintree_station_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611054021/https://en.wikipedia.org/wiki/Braintree_station_(MBTA)", "kind": "wikipedia", "quote": "A groundbreaking ceremony occurred on July 13, 1977", "tier": "tertiary", "title": "Braintree station (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Braintree_station_(MBTA)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260611113152/https://en.wikipedia.org/wiki/Quincy_Center_station", "kind": "other", "publisher": "Wikipedia", "quote": "Further construction began in 1977, and the line was extended to Braintree on March 22, 1980.", "tier": "secondary", "title": "Quincy Center station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Quincy_Center_station", "via": "https://en.wikipedia.org/wiki/Quincy_Center_station" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": null, "id": "boston-red-1983", "kind": "extension", "label": { "en": "Quincy Adams infill station opens (Braintree branch)" }, "notes": "Infill station on the already-open Quincy Center–Braintree segment; opened September 10, 1983 after construction delays. [Opening-date chase 2026-06-13] Quincy Adams infill opened September 10, 1983, later than the rest of the Braintree branch due to construction delays.", "opened": "1983-09-10", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "with Quincy Adams added as an infill in 1983", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 1 }, { "closed": "1983-09-01", "confidence": "medium", "constructionStart": "1978", "geometryRef": null, "id": "boston-red-1979", "kind": "extension", "label": { "en": "Temporary Harvard/Brattle terminus opens (Northwest Extension construction)" }, "notes": "Temporary Harvard/Brattle station served as northern terminus while the original Harvard station was demolished and rebuilt during the Northwest Extension project. Operated March 24, 1979 to September 1, 1983, then closed. [Date chase 2026-06-12] Harvard station article: construction contract approved Dec 7, 1977, groundbreaking Jan 23, 1978 for the temporary Harvard/Brattle station; Red Line article confirms NW Extension construction began 1978. [Opening-date chase 2026-06-13] Harvard/Brattle was a temporary terminus (Mar 24, 1979 – Sep 1, 1983) during Northwest Extension reconstruction.", "opened": "1979-03-24", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260426022315/https://en.wikipedia.org/wiki/Harvard_station", "kind": "wikipedia", "quote": "The station was open from March 24, 1979, to September 1, 1983, and was the northern terminus of the Red Line during that period.", "tier": "tertiary", "title": "Harvard station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Harvard_station" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "other", "publisher": "Wikipedia", "quote": "By the time the northwest extension began construction in 1978, opposition in Arlington and reductions in federal funding had caused the MBTA to choose the shorter Alewife alternative.", "tier": "secondary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "via": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ], "stationCount": 1 }, { "confidence": "low", "cost": { "basis": "outturn", "confidence": "low", "nominal": { "currency": "USD", "isEstimate": false, "value": 72000000, "year": 1985 }, "notes": "$72M covers the entire Harvard station reconstruction project (new station, tunnel realignment and busway, 1979–1985), not a single station element. Price level ~1985 (project completion). [Citation chase 2026-06-11] The $72M figure traces to a single Boston Globe article (Sept 8, 1985) cited by Wikipedia; that article is paywalled with no Wayback snapshot, so it could not be independently verified. It represents the actual completion (outturn) cost of the standalone Harvard reconstruction and is distinct from the MBTA's $574M four-station northwest extension.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260426022315/https://en.wikipedia.org/wiki/Harvard_station", "kind": "wikipedia", "quote": "The Church Street secondary entrance to the new station opened on September 6, 1983.", "tier": "tertiary", "title": "Harvard station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Harvard_station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260426022315/https://en.wikipedia.org/wiki/Harvard_station", "kind": "wikipedia", "quote": "The renovated busway opened on September 7, 1985, completing the $72 million construction project.", "tier": "tertiary", "title": "Harvard station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Harvard_station" } ] }, "geometryRef": null, "id": "boston-red-1983-2", "kind": "reopening", "label": { "en": "New Harvard station reopens (relocated, Northwest Extension)" }, "notes": "New Harvard station opened at a relocated position on September 6, 1983 (replacing the temporary Brattle terminus), as part of the Northwest Extension. Trains initially reversed at Davis without passengers before the Davis/Porter extension opened in Dec 1984. [Opening-date chase 2026-06-13] Revenue train service at the new (relocated) Harvard began Sep 6, 1983 (trains turned back at Davis without passengers); main lobby/headhouse and busway completed later (1985).", "opened": "1983-09-06", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260426022315/https://en.wikipedia.org/wiki/Harvard_station", "kind": "wikipedia", "quote": "The Church Street secondary entrance to the new station opened on September 6, 1983.", "tier": "tertiary", "title": "Harvard station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Harvard_station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260426022315/https://en.wikipedia.org/wiki/Harvard_station", "kind": "wikipedia", "quote": "The renovated busway opened on September 7, 1985, completing the $72 million construction project.", "tier": "tertiary", "title": "Harvard station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Harvard_station" } ] }, { "confidence": "medium", "constructionStart": "1978", "geometryRef": "boston-Red", "id": "boston-red-1984", "kind": "extension", "label": { "en": "Northwest Extension opens: Harvard → Davis (via Porter)" }, "notes": "Northwest Extension from Harvard to Davis, adding Porter and Davis stations. Opened December 8, 1984. [Date chase 2026-06-12] NW Extension (incl. Harvard-Davis) construction began 1978 per Red Line article (citing Boston Globe Jun 16, 1979); Harvard station Jan 23, 1978 groundbreaking marks the start of physical NW Extension work.", "opened": "1984-12-08", "segment": { "fromStopIndex": 1, "toStopIndex": 3 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "The line was extended to Davis with a station at Porter on December 8, 1984", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260426022315/https://en.wikipedia.org/wiki/Harvard_station", "kind": "other", "publisher": "Wikipedia", "quote": "A $1.4 million construction contract was approved on December 7, 1977, with a groundbreaking ceremony on January 23, 1978.", "tier": "secondary", "title": "Harvard station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Harvard_station", "via": "https://en.wikipedia.org/wiki/Harvard_station" } ], "stationCount": 2 }, { "confidence": "low", "constructionStart": "1979", "cost": { "basis": "outturn", "confidence": "high", "nominal": { "currency": "USD", "isEstimate": true, "value": 84000000, "year": 1985 }, "notes": "$84M is the cost of ALEWIFE STATION ALONE (budgeted $78M, final $84M), not the full Davis–Alewife segment. Price level ~1985. [Citation chase 2026-06-11] The $84M is the final actual (outturn) cost of Alewife station; $78M was the original estimate. Confirmed directly by the 1985 MBTA commemorative booklet (\"the $84 million glass-topped station\"). For reference, the full Red Line Northwest Extension cost ~$574M per the same MBTA document.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "The line was extended to its current terminus at Alewife on March 30, 1985", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260426020307/https://en.wikipedia.org/wiki/Alewife_station", "kind": "wikipedia", "quote": "Initially expected to cost $78 million to construct, the station ultimately cost $84 million.", "tier": "tertiary", "title": "Alewife station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Alewife_station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260426020307/https://en.wikipedia.org/wiki/Alewife_station", "kind": "wikipedia", "quote": "Construction began in 1979", "tier": "tertiary", "title": "Alewife station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Alewife_station" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "The $84 million glass-topped station features a 12-berth busway, bicycle racks, works of art, \"talkback\" radios on the platform, and special needs access.", "tier": "primary", "title": "Red Line Northwest Extension", "url": "https://archive.org/details/redlinenortheast00mass", "via": "https://en.wikipedia.org/wiki/Alewife_station" } ] }, "geometryRef": "boston-Red", "id": "boston-red-1985", "kind": "extension", "label": { "en": "Northwest Extension opens: Davis → Alewife (terminus)" }, "notes": "Final segment of the Northwest Extension to current terminus Alewife. Off-peak/initial service opened March 30, 1985; full peak-hour service to Alewife began December 26, 1985 after completion of the Alewife yard (until then peak Braintree trains terminated at Davis). Cost figure is for Alewife station only ($84M, ~1985), not the whole segment. [Date chase 2026-06-12] Year ambiguity: NW Extension programme construction began 1978 (Red Line article + Alewife Construction subsection), while the Alewife-specific work is dated to 1979 (Alewife lead), reportedly after the Fitchburg Cutoff right-of-way was freed. Curated 1979 retained as the Alewife-segment-specific date. [Opening-date chase 2026-06-13] Alewife opened to off-peak service Mar 30, 1985 (the revenue-service opening); peak-hour Braintree trains were not extended to Alewife until December 26, 1985 — same year, minor.", "opened": "1985-03-30", "segment": { "fromStopIndex": 0, "toStopIndex": 1 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "The line was extended to its current terminus at Alewife on March 30, 1985", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260426020307/https://en.wikipedia.org/wiki/Alewife_station", "kind": "wikipedia", "quote": "Initially expected to cost $78 million to construct, the station ultimately cost $84 million.", "tier": "tertiary", "title": "Alewife station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Alewife_station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260426020307/https://en.wikipedia.org/wiki/Alewife_station", "kind": "wikipedia", "quote": "Construction began in 1979", "tier": "tertiary", "title": "Alewife station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Alewife_station" } ], "stationCount": 1 } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260608233719/https://en.wikipedia.org/wiki/Red_Line_(MBTA)", "kind": "wikipedia", "quote": "extended south as the Dorchester Tunnel to Washington in 1915", "tier": "tertiary", "title": "Red Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Red_Line_(MBTA)" } ] }, { "cityId": "boston", "color": "#ED8B00", "displayNumber": "Orange", "id": "boston-line-Orange", "name": { "en": "Orange Line" }, "phases": [ { "confidence": "medium", "geometryRef": null, "id": "boston-orange-1901", "kind": "initial", "label": { "en": "Main Line Elevated opens: Sullivan Square → Dudley (Charlestown Elevated + Tremont Street subway + Washington Street Elevated)" }, "notes": "Original elevated rapid-transit Main Line of the Boston Elevated Railway. Ran from Sullivan Square in Charlestown over the Charlestown Elevated, through the Canal Street incline into the Tremont Street subway (later Green Line), out the Pleasant Street portal onto the Washington Street Elevated, terminating at Dudley Square (now Nubian Square), with intermediate elevated stations including Dover and Northampton. An Atlantic Avenue Elevated alternate downtown route also opened in 1901.", "opened": "1901-06-10", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113840/https://en.wikipedia.org/wiki/Washington_Street_Elevated", "kind": "wikipedia", "quote": "The initial section of the Main Line Elevated opened on June 10, 1901, running from Sullivan Square... the initial section of the elevated ran only to Dudley Square (now known as Nubian Square), with intermediate stations at Dover and Northampton.", "tier": "tertiary", "title": "Washington Street Elevated — Wikipedia", "url": "https://en.wikipedia.org/wiki/Washington_Street_Elevated" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113552/https://en.wikipedia.org/wiki/Orange_Line_(MBTA)", "kind": "wikipedia", "quote": "The Main Line of the electric Boston Elevated Railway opened in segments, starting in 1901.", "tier": "tertiary", "title": "Orange Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161220/https://en.wikipedia.org/wiki/Charlestown_Elevated", "kind": "other", "publisher": "Wikipedia", "quote": "Building of the elevated began in 1899 and it opened for revenue service on June 10, 1901.", "tier": "tertiary", "title": "Charlestown Elevated — Wikipedia", "url": "https://en.wikipedia.org/wiki/Charlestown_Elevated", "via": "https://en.wikipedia.org/wiki/Washington_Street_Elevated" } ] }, { "confidence": "low", "geometryRef": "boston-Orange", "id": "boston-orange-1908", "kind": "extension", "label": { "en": "Washington Street Tunnel opens (Main Line rerouted underground through downtown)" }, "notes": "New downtown subway tunnel for the Main Line, replacing its use of the Tremont Street subway through downtown and connecting via a new portal at the Canal Street incline. This freed the Tremont Street subway for through streetcars.", "opened": "1908-11-30", "segment": { "fromStopIndex": 7, "toStopIndex": 10 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113840/https://en.wikipedia.org/wiki/Washington_Street_Elevated", "kind": "wikipedia", "quote": "The Washington Street Tunnel was opened on November 30, 1908, providing a separate route for the Main Line and allowing use of the Tremont Street subway for through streetcars.", "tier": "tertiary", "title": "Washington Street Elevated — Wikipedia", "url": "https://en.wikipedia.org/wiki/Washington_Street_Elevated" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113552/https://en.wikipedia.org/wiki/Orange_Line_(MBTA)", "kind": "wikipedia", "quote": "In 1908, a new Washington Street Tunnel opened, allowing Main Line service to travel from the Charlestown Elevated, underground via an additional new portal at the Canal Street incline.", "tier": "tertiary", "title": "Orange Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-orange-1909", "kind": "extension", "label": { "en": "Washington Street Elevated extended: Dudley → Forest Hills" }, "notes": "Southern extension of the Washington Street Elevated, with an intermediate station at Egleston for streetcar transfers serving Roxbury and Dorchester. The Orange Line article dates this as 'By 1909'; the Washington Street Elevated article gives the precise date of November 22, 1909.", "opened": "1909-11-22", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113840/https://en.wikipedia.org/wiki/Washington_Street_Elevated", "kind": "wikipedia", "quote": "The elevated was extended south to Forest Hills on November 22, 1909, with an intermediate station at Egleston to transfer passengers from streetcars serving Roxbury and Dorchester.", "tier": "tertiary", "title": "Washington Street Elevated — Wikipedia", "url": "https://en.wikipedia.org/wiki/Washington_Street_Elevated" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113552/https://en.wikipedia.org/wiki/Orange_Line_(MBTA)", "kind": "wikipedia", "quote": "By 1909, the Washington Street Elevated had been extended south to Forest Hills.", "tier": "tertiary", "title": "Orange Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-orange-1912", "kind": "extension", "label": { "en": "Green Street infill station opens (Washington Street Elevated)" }, "notes": "Infill station added on the Washington Street Elevated between existing stops, with fewer streetcar connections. [Opening-date chase 2026-06-13] Green Street day-of-month is uncertain: WP prose/citation = Sep 22, 1912; WP stations table = Sep 11, 1912. Year 1912 is firm.", "opened": "1912-09-22", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113840/https://en.wikipedia.org/wiki/Washington_Street_Elevated", "kind": "wikipedia", "quote": "an infill station at Green Street with fewer streetcar connections was opened on September 22, 1912.", "tier": "tertiary", "title": "Washington Street Elevated — Wikipedia", "url": "https://en.wikipedia.org/wiki/Washington_Street_Elevated" } ], "stationCount": 1 }, { "confidence": "medium", "geometryRef": null, "id": "boston-orange-1919", "kind": "extension", "label": { "en": "Charlestown Elevated extended: Sullivan Square → Everett" }, "notes": "Northern extension of the Charlestown Elevated to a terminal at Everett, with a drawbridge over the Mystic River. The Everett terminal was built of wood and intended to be temporary. Opened the same year as the Great Molasses Flood (which partially damaged the Atlantic Avenue Elevated). Orange Line article gives '1919'; Everett station article gives March 15, 1919.", "opened": "1919-03-15", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260103112833/https://en.wikipedia.org/wiki/Everett_station_(MBTA)", "kind": "wikipedia", "quote": "Everett station was opened on March 15, 1919, when the Charlestown Elevated segment of the MBTA subway's Orange Line ran from the Canal Street Incline in downtown Boston through Charlestown to a terminal in Everett.", "tier": "tertiary", "title": "Everett station (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Everett_station_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113552/https://en.wikipedia.org/wiki/Orange_Line_(MBTA)", "kind": "wikipedia", "quote": "In 1919, the same year that the Atlantic Avenue Elevated was partially damaged in Boston's Great Molasses Flood, the Charlestown Elevated was extended north from Sullivan Square to Everett station.", "tier": "tertiary", "title": "Orange Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161220/https://en.wikipedia.org/wiki/Charlestown_Elevated", "kind": "other", "publisher": "Wikipedia", "quote": "Everett station was opened on March 15, 1919.", "tier": "tertiary", "title": "Charlestown Elevated — Wikipedia", "url": "https://en.wikipedia.org/wiki/Charlestown_Elevated", "via": "https://en.wikipedia.org/wiki/Everett_station_(MBTA)" } ], "stationCount": 1 }, { "closed": "1938", "confidence": "medium", "geometryRef": null, "id": "boston-orange-1938", "kind": "extension", "label": { "en": "Atlantic Avenue Elevated (downtown alternate route) fully closed" }, "notes": "Closure (not opening) phase: after a 1928 accident closed the southern portion, the remainder of the Atlantic Avenue Elevated shoreline alternate downtown route closed entirely in 1938, leaving the Washington Street Tunnel subway as the only downtown route for the Main Line. [Opening-date chase 2026-06-13] This phase records a CLOSURE (Atlantic Avenue Elevated last service Sep 30, 1938), not a line opening; 'opened: 1938' reflects the service-change year.", "opened": "1938", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113552/https://en.wikipedia.org/wiki/Orange_Line_(MBTA)", "kind": "wikipedia", "quote": "In 1938, the remainder of the Atlantic Avenue Elevated was closed, leaving the subway as the only route through downtown.", "tier": "tertiary", "title": "Orange Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161316/https://en.wikipedia.org/wiki/Atlantic_Avenue_Elevated", "kind": "other", "publisher": "Wikipedia", "quote": "The last day of service on the Atlantic Avenue Elevated was September 30, 1938.", "tier": "tertiary", "title": "Atlantic Avenue Elevated — Wikipedia", "url": "https://en.wikipedia.org/wiki/Atlantic_Avenue_Elevated", "via": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" } ] }, { "confidence": "low", "constructionStart": "1966", "cost": { "basis": "estimate", "confidence": "medium", "nominal": { "currency": "USD", "isEstimate": false, "value": 180000000, "year": 1977 }, "notes": "$180 million for the ENTIRE Haymarket North Extension (all stages 1975–1977), not this stage alone; described as over double the original estimate. Price-year approximate to completion period (mid-1970s). [Citation chase 2026-06-11] The MBTA's own 1977 Annual Report (primary, published after full completion) reports the final cost as $176 million for the entire Haymarket North Extension; the curated $180 million traces to a Boston Globe article dated March 23, 1975 — about two years before completion — and thus reflects a contemporary in-progress estimate rather than the audited final figure.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611114415/https://en.wikipedia.org/wiki/Haymarket_North_Extension", "kind": "wikipedia", "quote": "April 7, 1975 – Initial segment from Haymarket to Sullivan Square... Stations opened: North Station, Community College, and Sullivan Square. A groundbreaking ceremony occurred on September 22, 1966. The cost was over double original estimates at $180 million.", "tier": "tertiary", "title": "Haymarket North Extension — Wikipedia", "url": "https://en.wikipedia.org/wiki/Haymarket_North_Extension" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "The sixth and last station on the Orange Line's $176 million northern extension was opened for revenue service on March 19 at Oak Grove, Maiden, near the Melrose boundary.", "tier": "primary", "title": "Annual Report 1977 — Massachusetts Bay Transportation Authority", "url": "https://archive.org/details/annualreportmass1977mass/page/n54", "via": "https://en.wikipedia.org/wiki/Haymarket_North_Extension" } ] }, "geometryRef": "boston-Orange", "id": "boston-orange-1975", "kind": "extension", "label": { "en": "Haymarket North Extension Stage 1 opens: Haymarket → Sullivan Square (Charlestown Elevated replaced)" }, "notes": "First stage of the Haymarket North Extension, replacing the closed wooden Charlestown Elevated with a new underground/at-grade alignment. New stations: North Station, Community College, and Sullivan Square (rebuilt). Groundbreaking ceremony was September 22, 1966; the first segment took 8.5 years — twice as long as expected. Cost figure ($180M) covers the entire Haymarket North Extension, not this stage alone. [Date chase 2026-06-12] The September 22, 1966 groundbreaking is attributed by Wikipedia to a 1981 MBTA primary source ('A Chronicle of the Boston Transit System').", "opened": "1975-04-07", "segment": { "fromStopIndex": 4, "toStopIndex": 7 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611114415/https://en.wikipedia.org/wiki/Haymarket_North_Extension", "kind": "wikipedia", "quote": "April 7, 1975 – Initial segment from Haymarket to Sullivan Square... Stations opened: North Station, Community College, and Sullivan Square. A groundbreaking ceremony occurred on September 22, 1966. The cost was over double original estimates at $180 million.", "tier": "tertiary", "title": "Haymarket North Extension — Wikipedia", "url": "https://en.wikipedia.org/wiki/Haymarket_North_Extension" } ], "stationCount": 3 }, { "confidence": "low", "geometryRef": "boston-Orange", "id": "boston-orange-1975-2", "kind": "extension", "label": { "en": "Haymarket North Extension Stage 2 opens: Sullivan Square → Wellington" }, "notes": "Second stage, extending across the Mystic River via the new Edward Dana Bridge (which alone cost $9.1 million) to Wellington station.", "opened": "1975-09-06", "segment": { "fromStopIndex": 2, "toStopIndex": 4 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611114415/https://en.wikipedia.org/wiki/Haymarket_North_Extension", "kind": "wikipedia", "quote": "September 6, 1975 – Extension from Sullivan Square to Wellington station, including the new Edward Dana Bridge crossing the Mystic River.", "tier": "tertiary", "title": "Haymarket North Extension — Wikipedia", "url": "https://en.wikipedia.org/wiki/Haymarket_North_Extension" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "boston-Orange", "id": "boston-orange-1975-3", "kind": "extension", "label": { "en": "Haymarket North Extension Stage 3 opens: Wellington → Malden Center" }, "notes": "Third stage, extending to Malden Center station, which also included platforms for the Haverhill Line commuter rail.", "opened": "1975-12-27", "segment": { "fromStopIndex": 1, "toStopIndex": 2 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611114415/https://en.wikipedia.org/wiki/Haymarket_North_Extension", "kind": "wikipedia", "quote": "December 27, 1975 – Expansion to Malden Center station, which included platforms for the Haverhill Line commuter rail.", "tier": "tertiary", "title": "Haymarket North Extension — Wikipedia", "url": "https://en.wikipedia.org/wiki/Haymarket_North_Extension" } ], "stationCount": 1 }, { "confidence": "medium", "geometryRef": "boston-Orange", "id": "boston-orange-1977", "kind": "extension", "label": { "en": "Haymarket North Extension Stage 4 opens: Malden Center → Oak Grove (terminus)" }, "notes": "Final stage of the Haymarket North Extension, opening the northern terminus at Oak Grove in Malden. Wikipedia's Haymarket North Extension article gives March 19, 1977; some secondary summaries give March 20, 1977 — using the March 19 date from the dedicated article. [Opening-date chase 2026-06-13] Oak Grove opening day: March 19, 1977 per current Oak Grove article + Haymarket North Extension + primary 1977 MBTA Annual Report; the 'March 20' figure is from a stale WP revision.", "opened": "1977-03-19", "segment": { "fromStopIndex": 0, "toStopIndex": 1 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611114415/https://en.wikipedia.org/wiki/Haymarket_North_Extension", "kind": "wikipedia", "quote": "March 19, 1977 – Terminal segment to Oak Grove station in Malden.", "tier": "tertiary", "title": "Haymarket North Extension — Wikipedia", "url": "https://en.wikipedia.org/wiki/Haymarket_North_Extension" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251228060741/https://en.wikipedia.org/wiki/Oak_Grove_station", "kind": "wikipedia", "quote": "Oak Grove, the sixth and terminal station, opened on March 20, 1977.", "tier": "tertiary", "title": "Oak Grove station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Oak_Grove_station" }, { "accessedAt": "2026-06-13", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "Cited by Wikipedia's Haymarket North Extension article for March 19, 1977 Oak Grove opening; Oak Grove station article also cites this as supporting March 19 date.", "tier": "primary", "title": "1977 Annual Report — Massachusetts Bay Transportation Authority", "url": "https://archive.org/details/annualreportmass1977mass/page/n54", "via": "https://en.wikipedia.org/wiki/Haymarket_North_Extension" } ], "stationCount": 1 }, { "closed": "1987-04-30", "confidence": "high", "constructionStart": "1979", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "USD", "isEstimate": false, "value": 743000000, "year": 1987 }, "notes": "$743 million for the ENTIRE Southwest Corridor Project (Orange Line relocation + commuter rail + linear park), not the rail segment alone; some sources round to ~$750 million for the nine new stations. Funded in part from $600M of cancelled I-95 highway money transferred under the Interstate Highway Option. Construction began 1979. [Citation chase 2026-06-11] The $743M figure is not publicly verifiable in the attached sources: the Railfan article is paywalled (the dollar figure appears only in the paid Sept 2024 issue, and the archived copy is also paywalled), while the Wikipedia and Southwest Corridor Park sources confirm only the service dates and project scope, not the cost. The figure is corroborated in secondary scholarly literature (Altshuler & Luberoff, Mega-Projects, 2003, p.86) as the total Southwest Corridor Project cost, but that source is not currently attached.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113840/https://en.wikipedia.org/wiki/Washington_Street_Elevated", "kind": "wikipedia", "quote": "The last service over the Washington Street Elevated ran on April 30, 1987; service began over the Southwest Corridor route on May 4.", "tier": "tertiary", "title": "Washington Street Elevated — Wikipedia", "url": "https://en.wikipedia.org/wiki/Washington_Street_Elevated" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251206193427/https://railfan.com/mbta-orange-line-a-total-transformation/", "kind": "news", "quote": "The Southwest Corridor Project... cost $743 million... a new MBTA Orange Line relocated along the Corridor, with nine new stations.", "tier": "secondary", "title": "MBTA Orange Line: A Total Transformation — Railfan & Railroad Magazine", "url": "https://railfan.com/mbta-orange-line-a-total-transformation/" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20241015024326/https://southwestcorridorpark.org/history.asp", "kind": "other", "quote": "The new, mostly submerged, Orange Line was opened in 1987... May 1987: New Orange Line opens. ...construction started in 1979.", "tier": "secondary", "title": "Southwest Corridor Park — History", "url": "https://southwestcorridorpark.org/history.asp" } ] }, "geometryRef": "boston-Orange", "id": "boston-orange-1987", "kind": "extension", "label": { "en": "Southwest Corridor relocation: Washington Street Elevated closed (Apr 30), Orange Line rerouted onto new Southwest Corridor (Chinatown → Forest Hills)" }, "notes": "The deteriorating elevated Washington Street Elevated was demolished and the southern Orange Line relocated west onto the Southwest Corridor — a depressed/cut-and-cover alignment on land originally reserved for the cancelled Interstate 95. Last Washington Street Elevated service ran April 30, 1987; new Southwest Corridor service began May 4, 1987. The project built new stations along the corridor (Back Bay, Massachusetts Avenue, Ruggles, Roxbury Crossing, Jackson Square, Stony Brook, Green Street, Forest Hills, plus tie-ins) — sources state nine new stations. This is both a closure of the old elevated branch and an opening of the relocated route; categorized as extension/relocation. [Date chase 2026-06-12] Southwest Corridor Park history page directly states construction started in 1979 after nine years of planning; corroborated by the Washington Street Elevated article.", "opened": "1987-05-04", "segment": { "fromStopIndex": 10, "toStopIndex": 19 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113840/https://en.wikipedia.org/wiki/Washington_Street_Elevated", "kind": "wikipedia", "quote": "The last service over the Washington Street Elevated ran on April 30, 1987; service began over the Southwest Corridor route on May 4.", "tier": "tertiary", "title": "Washington Street Elevated — Wikipedia", "url": "https://en.wikipedia.org/wiki/Washington_Street_Elevated" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251206193427/https://railfan.com/mbta-orange-line-a-total-transformation/", "kind": "news", "quote": "The Southwest Corridor Project... cost $743 million... a new MBTA Orange Line relocated along the Corridor, with nine new stations.", "tier": "secondary", "title": "MBTA Orange Line: A Total Transformation — Railfan & Railroad Magazine", "url": "https://railfan.com/mbta-orange-line-a-total-transformation/" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20241015024326/https://southwestcorridorpark.org/history.asp", "kind": "other", "quote": "The new, mostly submerged, Orange Line was opened in 1987... May 1987: New Orange Line opens. ...construction started in 1979.", "tier": "secondary", "title": "Southwest Corridor Park — History", "url": "https://southwestcorridorpark.org/history.asp" } ], "stationCount": 9 }, { "confidence": "medium", "cost": { "basis": "budget", "confidence": "medium", "nominal": { "currency": "USD", "isEstimate": false, "value": 57000000, "year": 2014 }, "notes": "$57 million for the Assembly infill station, per the Orange Line Wikipedia article. [Citation chase 2026-06-11] Per the Boston Globe (Oct 6, 2011), the $57 million is the total design and construction budget for the single Assembly infill station, approved at the 2011 MBTA board contract stage; the figure is a ~2011 budget rather than a verified 2014 final outturn.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113552/https://en.wikipedia.org/wiki/Orange_Line_(MBTA)", "kind": "wikipedia", "quote": "Assembly station, an infill station, cost $57 million and opened September 2, 2014—the first new station on the MBTA subway system since 1987.", "tier": "tertiary", "title": "Orange Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20260613161457/https://www.boston.com/", "kind": "news", "publisher": "Boston Globe", "quote": "That station, with a total design and construction budget of $57 million, is considered the linchpin in a $1.5 billion plan to remake the long-abandoned, 65-acre site of a Ford Motor Co., assembly plant into a new neighborhood on the Somerville-Charlestown line", "tier": "secondary", "title": "MBTA board OK's millions for stations", "url": "https://web.archive.org/web/20120527221928/http://articles.boston.com/2011-10-06/news/30253264_1_blue-line-orange-line-red-line", "via": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" } ] }, "geometryRef": null, "id": "boston-orange-2014", "kind": "extension", "label": { "en": "Assembly infill station opens (between Sullivan Square and Wellington)" }, "notes": "First new station on the MBTA subway system since 1987; an infill station on the Haymarket North Extension segment serving the Assembly Row development. [Opening-date chase 2026-06-13] Opened to passengers Sep 2, 2014; some finishing construction continued until November 2014.", "opened": "2014-09-02", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113552/https://en.wikipedia.org/wiki/Orange_Line_(MBTA)", "kind": "wikipedia", "quote": "Assembly station, an infill station, cost $57 million and opened September 2, 2014—the first new station on the MBTA subway system since 1987.", "tier": "tertiary", "title": "Orange Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161307/https://en.wikipedia.org/wiki/Assembly_(MBTA_station)", "kind": "other", "publisher": "Wikipedia", "quote": "The station opened to passengers on September 2, 2014, although some final construction work lasted until November.", "tier": "tertiary", "title": "Assembly station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Assembly_(MBTA_station)", "via": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161455/https://en.wikipedia.org/wiki/Haymarket_North_Extension", "kind": "other", "publisher": "Wikipedia", "quote": "Assembly station opened on September 2, 2014. It was the first fully new station on the MBTA subway system since 1987.", "tier": "tertiary", "title": "Haymarket North Extension — Wikipedia", "url": "https://en.wikipedia.org/wiki/Haymarket_North_Extension", "via": "https://en.wikipedia.org/wiki/Haymarket_North_Extension" } ], "stationCount": 1 } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611113552/https://en.wikipedia.org/wiki/Orange_Line_(MBTA)", "kind": "wikipedia", "quote": "The Main Line of the electric Boston Elevated Railway opened in segments, starting in 1901.", "tier": "tertiary", "title": "Orange Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Orange_Line_(MBTA)" } ] }, { "cityId": "boston", "color": "#003DA5", "displayNumber": "Blue", "id": "boston-line-Blue", "name": { "en": "Blue Line" }, "phases": [ { "confidence": "medium", "constructionStart": "1900", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "USD", "isEstimate": false, "value": 3000000, "year": 1904 }, "notes": "Cost of the original East Boston Tunnel excavation. Built as a STREETCAR tunnel (converted to heavy rail only in 1924); first North American subway tunnel beneath a body of water. Construction took 2.5 years. [Citation chase 2026-06-11] The $3M figure is a single round summary attributed to one primary source — Cudahy, \"Change at Park Street Under\" (1972), p. 30 — which is borrow-restricted on the Internet Archive and could not be verified verbatim; Wikipedia is the only readable corroboration.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260504150755/https://en.wikipedia.org/wiki/Blue_Line_(MBTA)", "kind": "wikipedia", "quote": "the first North American subway tunnel to run beneath a body of water when it opened in 1904", "tier": "tertiary", "title": "Blue Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251008041416/https://en.wikipedia.org/wiki/East_Boston_Tunnel", "kind": "wikipedia", "quote": "from Maverick Square in East Boston to downtown Boston's Court Street station, with an intermediate stop at Devonshire (now State). The excavation took two-and-a-half years, and cost $3 million and the lives of four workmen.", "tier": "tertiary", "title": "East Boston Tunnel — Wikipedia", "url": "https://en.wikipedia.org/wiki/East_Boston_Tunnel" }, { "accessedAt": "2026-06-11", "kind": "other", "publisher": "S. Greene Press (Brattleboro, VT)", "tier": "primary", "title": "Change at Park Street Under: The Story of Boston's Subways, p. 30", "url": "https://archive.org/details/changeatparkstre00cuda/page/31", "via": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" } ] }, "geometryRef": "boston-Blue", "id": "boston-blue-1904", "kind": "initial", "label": { "en": "East Boston Tunnel opens: Maverick Square (East Boston) → Court Street (downtown Boston), with intermediate stop at Devonshire (now State) — streetcar subway" }, "notes": "[Date chase 2026-06-12] BTC annual report (year ending June 30, 1904) and MassHist both date construction start to 5 May 1900; curated 1902 likely reflects the 2.5-year under-harbor excavation window, not project start. Construction-start corrected 1902→1900 [Date chase 2026-06-12 — panel-confirmed, corrected w/ sign-off] [Opening-date chase 2026-06-13] December 30, 1904 was the public/revenue-service opening of the East Boston Tunnel (streetcar subway from Court Street to Maverick portal); no ceremonial-vs-public distinction noted.", "opened": "1904-12-30", "segment": { "from": [ -71.0395, 42.3691 ], "to": [ -71.0578, 42.3587 ] }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260504150755/https://en.wikipedia.org/wiki/Blue_Line_(MBTA)", "kind": "wikipedia", "quote": "the first North American subway tunnel to run beneath a body of water when it opened in 1904", "tier": "tertiary", "title": "Blue Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251008041416/https://en.wikipedia.org/wiki/East_Boston_Tunnel", "kind": "wikipedia", "quote": "from Maverick Square in East Boston to downtown Boston's Court Street station, with an intermediate stop at Devonshire (now State). The excavation took two-and-a-half years, and cost $3 million and the lives of four workmen.", "tier": "tertiary", "title": "East Boston Tunnel — Wikipedia", "url": "https://en.wikipedia.org/wiki/East_Boston_Tunnel" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260611054208/https://en.wikipedia.org/wiki/Aquarium_station_(MBTA)", "kind": "other", "publisher": "Wikipedia", "quote": "The East Boston Tunnel opened on December 30, 1904, serving streetcars which ran between Court Street downtown and Maverick portal in East Boston.", "tier": "tertiary", "title": "Aquarium station (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Aquarium_station_(MBTA)", "via": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260611054210/https://en.wikipedia.org/wiki/State_station", "kind": "other", "publisher": "Wikipedia", "quote": "The Blue Line section of the station was built along with the rest of the East Boston Tunnel in the first years of the 20th century and opened on December 30, 1904, serving streetcars running from downtown to East Boston.", "tier": "tertiary", "title": "State station — Wikipedia", "url": "https://en.wikipedia.org/wiki/State_station", "via": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" } ], "stationCount": 4 }, { "confidence": "medium", "geometryRef": null, "id": "boston-blue-1906", "kind": "extension", "label": { "en": "Atlantic station (now Aquarium) opens as intermediate stop in the East Boston Tunnel" }, "notes": "[Opening-date chase 2026-06-13] Sources specify April 5, 1906 (Atlantic Avenue station, now Aquarium), citing the 12th Annual Report of the Boston Transit Commission; the curated year-only date could be tightened to 1906-04-05.", "opened": "1906", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260504150755/https://en.wikipedia.org/wiki/Blue_Line_(MBTA)", "kind": "wikipedia", "quote": "In 1906, Atlantic Station (now Aquarium) was opened", "tier": "tertiary", "title": "Blue Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260611054208/https://en.wikipedia.org/wiki/Aquarium_station_(MBTA)", "kind": "other", "publisher": "Wikipedia", "quote": "Atlantic Avenue station opened in the tunnel on April 5, 1906. Construction of the intermediate station at Atlantic Avenue under the Elevated was delayed; it opened on April 5, 1906.", "tier": "tertiary", "title": "Aquarium station (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Aquarium_station_(MBTA)", "via": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" } ], "stationCount": 1 }, { "confidence": "high", "constructionStart": "1912", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "USD", "isEstimate": false, "value": 2400000, "year": 1916 }, "notes": "Total cost of the 0.5-mile (0.8 km) Bowdoin extension. Construction began November 29, 1912; Court Street station was abandoned November 15, 1914 (service cut back to Devonshire) and replaced by the new Scollay Under platform. New terminal station/loop at Bowdoin Square. [Citation chase 2026-06-11] The $2.4 million total derives from a Boston Globe report (March 18, 1916) and represents the reported actual cost; the 1915 Boston Transit Commission Annual Report separately lists authorized debt of $2,450,000 for the East Boston Tunnel Extension, roughly consistent. The underlying Globe source is paywalled and could not be independently verified.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251008041416/https://en.wikipedia.org/wiki/East_Boston_Tunnel", "kind": "wikipedia", "quote": "from Scollay Square (where a new platform, Scollay Under, was constructed to replace Court Street station) to a new station and loop at Bowdoin Square. ... The total cost of the extension was $2.4 million.", "tier": "tertiary", "title": "East Boston Tunnel — Wikipedia", "url": "https://en.wikipedia.org/wiki/East_Boston_Tunnel" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260504150755/https://en.wikipedia.org/wiki/Blue_Line_(MBTA)", "kind": "wikipedia", "quote": "Bowdoin station opened on March 18 along with the Joy Street Portal", "tier": "tertiary", "title": "Blue Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" } ] }, "geometryRef": "boston-Blue", "id": "boston-blue-1916", "kind": "extension", "label": { "en": "Bowdoin extension opens: Scollay Square (new Scollay Under platform) → Bowdoin Square + Joy Street Portal (Court Street closed 1914)" }, "notes": "[Date chase 2026-06-12] BTC Annual Report 1913 p.46 corroborates the November 29, 1912 construction start (underpinning at Scollay Square in progress). [Opening-date chase 2026-06-13] March 13, 1916 saw service extended to the new Scollay Under platform with streetcars looping empty around Bowdoin; March 18, 1916 was the actual public/revenue passenger opening of Bowdoin.", "opened": "1916-03-18", "segment": { "from": [ -71.0578, 42.3587 ], "to": [ -71.062, 42.3614 ] }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251008041416/https://en.wikipedia.org/wiki/East_Boston_Tunnel", "kind": "wikipedia", "quote": "from Scollay Square (where a new platform, Scollay Under, was constructed to replace Court Street station) to a new station and loop at Bowdoin Square. ... The total cost of the extension was $2.4 million.", "tier": "tertiary", "title": "East Boston Tunnel — Wikipedia", "url": "https://en.wikipedia.org/wiki/East_Boston_Tunnel" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260504150755/https://en.wikipedia.org/wiki/Blue_Line_(MBTA)", "kind": "wikipedia", "quote": "Bowdoin station opened on March 18 along with the Joy Street Portal", "tier": "tertiary", "title": "Blue Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613161408/https://archive.org/details/annualreportofbo19bost?view=theater", "kind": "primary", "publisher": "Boston Transit Commission", "quote": "The work thus far done upon the extension of the East Boston tunnel has been in underpinning the buildings and the present station in Scollay square, a work of considerable difficulty.", "tier": "primary", "title": "Annual report of the Boston Transit Commission for the year ending June 30, 1913 — page 46", "url": "https://archive.org/stream/annualreportofbo19bost#page/46/mode/2up", "via": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260216020000/https://en.wikipedia.org/wiki/Bowdoin_station", "kind": "other", "publisher": "Wikipedia", "quote": "Bowdoin station opened on March 18, 1916 with actual passenger service. On March 13, 1916, service was extended to the new Scollay Under, with streetcars looping empty around the Bowdoin loop.", "tier": "tertiary", "title": "Bowdoin station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Bowdoin_station", "via": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "kind": "news", "publisher": "Boston Globe / Newspapers.com", "tier": "secondary", "title": "Few Used New Bowdoin Sq Tunnel Immediately After its Opening — Boston Globe, March 18, 1916", "url": "https://www.newspapers.com/clip/53079017/the-boston-globe/", "via": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": null, "id": "boston-blue-1924", "kind": "renumber", "label": { "en": "East Boston Tunnel converted from streetcar to heavy-rail rapid transit (high-floor metro trains), Bowdoin → Maverick" }, "notes": "[Opening-date chase 2026-06-13] April 21, 1924 is the revenue-service start (end of the April 18-21 conversion weekend), using temporary wooden platforms; permanent concrete platforms followed over the next months.", "opened": "1924-04-21", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251008041416/https://en.wikipedia.org/wiki/East_Boston_Tunnel", "kind": "wikipedia", "quote": "Over the weekend of April 18–21, 1924, the East Boston Tunnel was converted to use the new high-floor trains", "tier": "tertiary", "title": "East Boston Tunnel — Wikipedia", "url": "https://en.wikipedia.org/wiki/East_Boston_Tunnel" } ] }, { "confidence": "medium", "constructionStart": "1948", "geometryRef": "boston-Blue", "id": "boston-blue-1952", "kind": "extension", "label": { "en": "Revere extension phase 1 opens: Maverick → Orient Heights along the former Boston, Revere Beach & Lynn Railroad — new stations Airport, Wood Island, Orient Heights" }, "notes": "[Date chase 2026-06-12] BRB&L Wikipedia (citing Cheney 2003) dates construction start to October 1948; curated 1952 is the phase-1 opening year, not construction start. Construction-start corrected 1952→1948 [Date chase 2026-06-12 — panel-confirmed, corrected w/ sign-off] [Opening-date chase 2026-06-13] January 5, 1952 was the public/revenue opening; station-level sources cite Belcher's BSRA 'Changes to Transit Service in the MBTA district'.", "opened": "1952-01-05", "segment": { "from": [ -71.0395, 42.3691 ], "to": [ -71.0067, 42.3868 ] }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260403152059/https://en.wikipedia.org/wiki/Airport_station_(MBTA)", "kind": "wikipedia", "quote": "The Metropolitan Transit Authority (MTA) opened the first phase of the Revere Extension on January 5, 1952, with new stations at Airport, Wood Island, and Orient Heights.", "tier": "tertiary", "title": "Airport station (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Airport_station_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260504150755/https://en.wikipedia.org/wiki/Blue_Line_(MBTA)", "kind": "wikipedia", "quote": "From 1952 to 1954, a surface-level extension was constructed along the recently defunct Boston, Revere Beach and Lynn Railroad, from Maverick to the current terminus at Wonderland.", "tier": "tertiary", "title": "Blue Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260312170054/https://en.wikipedia.org/wiki/Orient_Heights_station", "kind": "other", "publisher": "Wikipedia", "quote": "The first part of the Revere Extension opened to Orient Heights on January 5, 1952, with intermediate stations at Airport and Day Square.", "tier": "tertiary", "title": "Orient Heights station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Orient_Heights_station", "via": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" } ], "stationCount": 3 }, { "confidence": "low", "geometryRef": "boston-Blue", "id": "boston-blue-1952-2", "kind": "extension", "label": { "en": "Revere extension: Suffolk Downs station opens (Orient Heights → Suffolk Downs)" }, "notes": "[Opening-date chase 2026-06-13] Suffolk Downs opened April 21, 1952 (first day of the racing season) as a seasonal, single-track/single-platform station; it became year-round on June 19, 1954 with a second platform.", "opened": "1952-04-21", "segment": { "from": [ -71.0067, 42.3868 ], "to": [ -70.9966, 42.3902 ] }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260129142317/https://en.wikipedia.org/wiki/Suffolk_Downs_station", "kind": "wikipedia", "quote": "Suffolk Downs station opened on April 21, 1952.", "tier": "tertiary", "title": "Suffolk Downs station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Suffolk_Downs_station" } ], "stationCount": 1 }, { "confidence": "medium", "geometryRef": "boston-Blue", "id": "boston-blue-1954", "kind": "extension", "label": { "en": "Revere extension phase 2 opens: Suffolk Downs → Wonderland — new stations Beachmont, Revere Beach, Wonderland (terminus)" }, "notes": "DATE CONFLICT: station infoboxes (Wonderland, Beachmont, Revere Beach — Wikipedia) and the body text consistently give June 19, 1954; the Blue Line main-article station TABLE and Wikidata give January 19, 1954. Using the widely-supported June 19, 1954 from the station articles and recording the discrepancy. The extension was 'cut short due to limited funds' — it was intended to reach Lynn but terminated at Wonderland. [Opening-date chase 2026-06-13] June 19, 1954 confirmed by multiple station articles citing the Boston Globe ('Rapid Transit Line to Revere to Open June 19', June 9, 1954); a stray 'January 1954' in passing Wikipedia text is an editorial error contradicted by all sourced dates.", "opened": "1954-06-19", "segment": { "from": [ -70.9966, 42.3902 ], "to": [ -70.9919, 42.4135 ] }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260508063316/https://en.wikipedia.org/wiki/Wonderland_station", "kind": "wikipedia", "quote": "the second phase (cut short due to limited funds) opened to Wonderland on June 19, 1954", "tier": "tertiary", "title": "Wonderland station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Wonderland_station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260109190546/https://en.wikipedia.org/wiki/Revere_Beach_station", "kind": "wikipedia", "quote": "the second phase (cut short due to limited funds) opened to Wonderland on June 19, 1954 with intermediate stations at Beachmont and Revere Beach.", "tier": "tertiary", "title": "Revere Beach station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Revere_Beach_station" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260418201248/https://en.wikipedia.org/wiki/Beachmont_station", "kind": "other", "publisher": "Wikipedia", "quote": "Beachmont station opened on June 19, 1954 as part of the second phase of the Revere Extension.", "tier": "tertiary", "title": "Beachmont station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Beachmont_station", "via": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" } ], "stationCount": 3 }, { "confidence": "low", "geometryRef": null, "id": "boston-blue-1965", "kind": "renumber", "label": { "en": "Route renamed 'Blue Line' under MBTA color-based rebranding (previously 'East Boston Tunnel & Revere Extension' / Route 3)" }, "notes": "[Opening-date chase 2026-06-13] August 26, 1965 marks the renaming to 'Blue Line' under the MBTA color rebranding (not a physical opening); only Wikipedia attests this date, no primary government source located.", "opened": "1965-08-26", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260504150755/https://en.wikipedia.org/wiki/Blue_Line_(MBTA)", "kind": "wikipedia", "quote": "It was renamed as the Blue Line on August 26, 1965, as part of the new MBTA's color-based rebranding.", "tier": "tertiary", "title": "Blue Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" } ] } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260504150755/https://en.wikipedia.org/wiki/Blue_Line_(MBTA)", "kind": "wikipedia", "quote": "the first North American subway tunnel to run beneath a body of water when it opened in 1904", "tier": "tertiary", "title": "Blue Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Blue_Line_(MBTA)" } ] }, { "cityId": "boston", "color": "#00843D", "displayNumber": "Green-B", "id": "boston-line-Green-B", "name": { "en": "Green Line B Branch" }, "phases": [ { "confidence": "medium", "geometryRef": "boston-Green-B", "id": "boston-green-b-1896", "kind": "initial", "label": { "en": "Commonwealth Avenue streetcar service opens: Lake Street → downtown Boston (Boston Elevated Railway)" }, "notes": "Origin of the line as a streetcar route on Commonwealth Avenue; predates the 'B branch' designation by 71 years. Lake Street (later Boston College) is the western terminus that the branch still uses today.", "opened": "1896-08-15", "segment": { "fromStopIndex": 0, "toStopIndex": 16 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "Service between Lake Street and downtown Boston began on August 15, 1896.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260311032543/https://en.wikipedia.org/wiki/Boston_College_station", "kind": "wikipedia", "quote": "On August 15, 1896, the Boston Elevated Railway (BERy) added tracks on newly constructed Commonwealth Avenue from the Newton town line east to Chestnut Hill Avenue", "tier": "tertiary", "title": "Boston College station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Boston_College_station" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20200917172003/https://www.newspapers.com/clip/53147423/the-boston-globe/", "kind": "news", "publisher": "Boston Globe / Newspapers.com", "quote": "[Cited in wikitext as the primary reference for the August 15, 1896 opening; behind Newspapers.com paywall — could not access full text]", "tier": "secondary", "title": "Newton — Boston Globe, August 15, 1896, p. 3", "url": "https://www.newspapers.com/clip/53147423/the-boston-globe/", "via": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ] }, { "confidence": "medium", "geometryRef": "boston-Green-B", "id": "boston-green-b-1897", "kind": "extension", "label": { "en": "Streetcars rerouted into Tremont Street Subway to Park Street (subway integration)" }, "notes": "The Tremont Street Subway (opened 1 Sept 1897) is the oldest subway in the US; it is shared trunk infrastructure used by all Green Line branches, not exclusive to the B branch. [Opening-date chase 2026-06-13] Curated 1897-09-01 is the Tremont Street subway opening date; the Lake Street/Nonantum Square streetcars were rerouted into the subway 'soon after' that opening, not necessarily on exactly Sept 1.", "opened": "1897-09-01", "segment": { "fromStopIndex": 20, "toStopIndex": 22 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "Both the Nonantum Square and Lake Street lines were rerouted into the Tremont Street subway to terminate at Park Street station soon after the tunnel's September 1, 1897 opening.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260531233717/https://en.wikipedia.org/wiki/Tremont_Street_subway", "kind": "other", "publisher": "Wikipedia", "quote": "opening on September 1, 1897. A contemporary source from the Boston Daily Globe is cited with the headline 'First Car off the Earth: Allston Electric Goes into the subway on schedule time,' published on September 1, 1897", "tier": "tertiary", "title": "Tremont Street subway — Wikipedia", "url": "https://en.wikipedia.org/wiki/Tremont_Street_subway", "via": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-green-b-1900", "kind": "extension", "label": { "en": "Commonwealth Avenue tracks completed Chestnut Hill Ave → Packards Corner; Lake Street becomes Commonwealth Ave line terminus" }, "notes": "Completed the modern Commonwealth Avenue alignment of the present-day B branch, giving direct Lake Street → downtown service via Commonwealth Avenue.", "opened": "1900-05-26", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "The BERy opened new tracks on Commonwealth Avenue from Chestnut Hill Avenue to Brighton Avenue on May 26, 1900, allowing direct service from Lake Street to downtown via Commonwealth Avenue.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260311032543/https://en.wikipedia.org/wiki/Boston_College_station", "kind": "wikipedia", "quote": "On May 26, 1900, tracks on Commonwealth Avenue were completed from Chestnut Hill Avenue to Packards Corner, at which point Lake Street became the terminus of the Commonwealth Avenue line", "tier": "tertiary", "title": "Boston College station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Boston_College_station" } ] }, { "confidence": "medium", "geometryRef": "boston-Green-B", "id": "boston-green-b-1914", "kind": "extension", "label": { "en": "Boylston Street Subway opens (extension of Tremont St subway toward Kenmore/Governors Square)" }, "notes": "Shared trunk infrastructure used by multiple Green Line branches, not exclusive to the B branch. Added Copley Square and Massachusetts Avenue (now Hynes Convention Center) stops.", "opened": "1914-10-03", "segment": { "fromStopIndex": 16, "toStopIndex": 20 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "The Boylston Street subway opened on October 3, 1914, acting as an extension of the Tremont Street subway to just east of Governors Square, with intermediate stops at Copley Square and Massachusetts Avenue.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-13", "kind": "news", "publisher": "Boston Globe / Newspapers.com", "quote": "[Cited in wikitext as reference for Oct 3, 1914 Boylston Street subway opening; behind Newspapers.com paywall — could not access full text. Article dated Oct 1 may be a preview article two days before the opening.]", "tier": "secondary", "title": "Changes Made by New Subway — Boston Globe, October 1, 1914, p. 3", "url": "https://www.newspapers.com/clip/54438602/the-boston-globe/", "via": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ], "stationCount": 2 }, { "confidence": "medium", "geometryRef": null, "id": "boston-green-b-1932", "kind": "extension", "label": { "en": "Kenmore subway opens with separate Blandford Street (Commonwealth Ave) and St. Mary's Street (Beacon St) portals" }, "notes": "The Blandford Street portal is the dedicated subway portal of the present-day B branch (where it enters the tunnel from Commonwealth Avenue). Wikipedia reports the Kenmore subway was projected at roughly $5 million but gives no sourced final outturn figure attributable to the B-branch alignment specifically, so cost is omitted.", "opened": "1932-10-23", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "Kenmore station and the new subway, which split to separate portals at Saint Mary's Street on Beacon Street and Blandford Street on Commonwealth Avenue, opened on October 23, 1932.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-13", "kind": "primary", "publisher": "Boston Elevated Railway", "quote": "[Cited in wikitext as primary reference for October 23, 1932 opening of Kenmore station and subway; Internet Archive copy cited — not independently fetched but a primary operator document]", "tier": "primary", "title": "Annual report of the public trustees of the Boston Elevated Railway (14th edition), p. 14", "url": "https://archive.org/details/annualreportofpu32bost", "via": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-green-b-1965", "kind": "renumber", "label": { "en": "Streetcar routes feeding the Tremont Street subway rebranded as the Green Line" }, "notes": "Branding/identity change (no new construction): the Commonwealth Avenue / Boston College streetcar route became part of the MBTA Green Line.", "opened": "1965-08-26", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "As part of systemwide rebranding efforts, the remaining streetcar routes feeding the Tremont Street subway became the Green Line on August 26, 1965.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-green-b-1967", "kind": "renumber", "label": { "en": "Green Line branches lettered; the Boston College (Commonwealth Avenue) line becomes the 'B' branch" }, "notes": "Designation change only: this is the point at which the line formally became 'Green Line B branch'. No exact date documented beyond the year 1967.", "opened": "1967", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "In 1967, the five branches were given letters to distinguish them; the Boston College line became the B branch.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ] }, { "closed": "2004-04-20", "confidence": "medium", "geometryRef": null, "id": "boston-green-b-2005", "kind": "renumber", "label": { "en": "Four low-ridership surface stops closed (Greycliff Rd, Mount Hood Rd, Summit Ave, Fordham Rd) — pilot, made permanent 2005" }, "notes": "Stop consolidation, not a reopening: four close-spaced surface stops were closed (pilot from 20 Apr 2004) and the closures were made permanent on 15 Mar 2005. 'opened' field used to record the permanent-removal date; 'closed' records the start of the pilot closure. stationCount reflects a reduction of four, not an addition. [Opening-date chase 2026-06-13] The four stops (Greycliff Rd, Mount Hood Rd, Summit Ave, Fordham Rd) were physically closed April 20, 2004 as a 6-8 month pilot; the curated 2005-03-15 date is the MBTA board vote that made the closures permanent, confirmed by the Boston Globe.", "opened": "2005-03-15", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "On April 20, 2004, the other four stops were closed as a 6-to-8-month pilot program", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "On March 15, 2005, after a survey showed that 73% of 1,142 riders surveyed approved of the closures, the MBTA board voted to make the closures permanent.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260528230727/http://archive.boston.com/news/local/articles/2005/03/16/t_drops_4_green_line_stops_after_results_of_rider_survey/", "kind": "news", "publisher": "Boston Globe", "quote": "The MBTA decided yesterday to permanently eliminate four stops on the traditionally slow B branch of the Green Line after a survey that some had hoped would save the stops backfired.", "tier": "secondary", "title": "T drops 4 Green Line stops after results of rider survey — Boston Globe, March 16, 2005", "url": "http://archive.boston.com/news/local/articles/2005/03/16/t_drops_4_green_line_stops_after_results_of_rider_survey/", "via": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ] }, { "confidence": "high", "constructionStart": "2021-02", "cost": { "basis": "budget", "confidence": "high", "nominal": { "currency": "USD", "isEstimate": false, "value": 17800000, "year": 2020 }, "notes": "Construction contract awarded 23 March 2020 for the B Branch Station Consolidation project, which replaced four close-spaced surface stops with two accessible stations (Babcock Street and Amory Street). [Citation chase 2026-06-11] This $17.8M ($17,768,400 exactly) is the construction contract award to MAS Building and Bridge, Inc.; the full B Branch Station Consolidation Project budget was $29,278,291 per the MBTA press release.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "The two new stations, Babcock Street and Amory Street, opened on November 15, 2021.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "The MBTA awarded a $17.8 million construction contract on March 23, 2020.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20250823094348/https://www.mbta.com/news/2020-03-23/fmcb-awards-178-million-b-branch-station-consolidation-work", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "MAS Building and Bridge, Inc. was today awarded a total of $17,768,400 with the B branch Station Consolidation Project budget totaling $29,278,291.", "tier": "secondary", "title": "FMCB Awards $17.8 Million for B Branch Station Consolidation Work", "url": "https://mbta.com/news/2020-03-23/fmcb-awards-178-million-b-branch-station-consolidation-work", "via": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ] }, "geometryRef": null, "id": "boston-green-b-2021", "kind": "renumber", "label": { "en": "BU-area station consolidation: four close-spaced stops replaced by two new stations, Babcock Street & Amory Street" }, "notes": "Net station consolidation: four old stops removed, two new accessible stations built (net reduction of two). stationCount=2 records the two newly built stations. Construction began 2020 (contract awarded 23 Mar 2020); stations opened 15 Nov 2021. [Date chase 2026-06-12] Construction contract awarded 2020-03-23; the originally projected fall-2020 start slipped and actual construction began February 2021 per MBTA's March 31, 2021 press release. Construction-start corrected 2020→2021-02 [Date chase 2026-06-12 — panel-confirmed, corrected w/ sign-off]", "opened": "2021-11-15", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "The two new stations, Babcock Street and Amory Street, opened on November 15, 2021.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "The MBTA awarded a $17.8 million construction contract on March 23, 2020.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613161522/https://cdn.mbta.com/sites/default/files/2021-01/2021-01-28-glt-b-branch-station-consolidation-meeting-presentation.pdf", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "Construction was to last from February 2021 to early 2022, with night and weekend bustitution for much of 2021.", "tier": "primary", "title": "B Branch Station Consolidation Project: Virtual Public Meeting", "url": "https://cdn.mbta.com/sites/default/files/2021-01/2021-01-28-glt-b-branch-station-consolidation-meeting-presentation.pdf", "via": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20250901220641/https://www.mbta.com/news/2021-03-31/building-better-t-green-line-b-branch-station-consolidation-project-work-taking", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "Construction began in February 2021 with an anticipated completion in late 2021.", "tier": "primary", "title": "Building a Better T: Green Line B Branch Station Consolidation Project Work Taking Place", "url": "https://www.mbta.com/news/2021-03-31/building-better-t-green-line-b-branch-station-consolidation-project-work-taking", "via": "https://en.wikipedia.org/wiki/Green_Line_B_branch" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260418200813/https://www.mbta.com/projects/green-line-b-branch-station-consolidation/update/new-babcock-street-and-amory-street", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "On November 15, 2021, we're opening two new fully accessible stations at Babcock Street and Amory Street.", "tier": "primary", "title": "New Babcock Street and Amory Street Stations Open November 15", "url": "https://www.mbta.com/projects/green-line-b-branch-station-consolidation/update/new-babcock-street-and-amory-street", "via": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ], "stationCount": 2 } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260609060913/https://en.wikipedia.org/wiki/Green_Line_B_branch", "kind": "wikipedia", "quote": "Service between Lake Street and downtown Boston began on August 15, 1896.", "tier": "tertiary", "title": "Green Line B branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_B_branch" } ] }, { "cityId": "boston", "color": "#00843D", "displayNumber": "Green-C", "id": "boston-line-Green-C", "name": { "en": "Green Line C Branch" }, "phases": [ { "confidence": "low", "geometryRef": "boston-Green-C", "id": "boston-green-c-1888", "kind": "initial", "label": { "en": "Initial streetcar line opens: Massachusetts Avenue → Coolidge Corner (Beacon Street tracks laid)" }, "notes": "[Opening-date chase 2026-06-13] Underlying ref is Clarke & Cummings (1997), offline; only year-level support exists. 1888 reflects when tracks were laid (Mass Ave -> Coolidge Corner).", "opened": "1888", "segment": { "fromStopIndex": 8, "toStopIndex": 12 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260107102204/https://en.wikipedia.org/wiki/Green_Line_C_branch", "kind": "wikipedia", "quote": "The first tracks on Beacon Street were laid in 1888, running from Massachusetts Avenue west to Coolidge Corner.", "tier": "tertiary", "title": "Green Line C branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_C_branch" } ] }, { "confidence": "low", "geometryRef": "boston-Green-C", "id": "boston-green-c-1889", "kind": "extension", "label": { "en": "Extension opens: Coolidge Corner → Cleveland Circle (with Reservoir carhouse access); Beacon Street line electrified" }, "notes": "Wikipedia phrases the Cleveland Circle extension and electrification as both occurring 'the next year' (1889), i.e. the year after the 1888 initial tracks. [Opening-date chase 2026-06-13] Year-level only; passage uncited inline but corroborated by the article's station listing (Winchester St-Cleveland Circle = 1889).", "opened": "1889", "segment": { "fromStopIndex": 0, "toStopIndex": 8 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260107102204/https://en.wikipedia.org/wiki/Green_Line_C_branch", "kind": "wikipedia", "quote": "The next year the rest of the line to Cleveland Circle opened, with access to the Reservoir carhouse. That same year, the line on Beacon Street to Cleveland Circle was electrified.", "tier": "tertiary", "title": "Green Line C branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_C_branch" } ] }, { "confidence": "medium", "geometryRef": "boston-Green-C", "id": "boston-green-c-1897", "kind": "extension", "label": { "en": "Beacon Street service routed into the Tremont Street subway via the Public Garden incline (turning at Park Street)" }, "notes": "Beacon Street cars began running into the Tremont Street subway on its 1 Sept 1897 opening; the subway itself is shared trunk infrastructure, not exclusive to this branch. [Opening-date chase 2026-06-13] Tremont Street subway article independently confirms September 1, 1897 (Boston Daily Globe same-day headline noted there). This is the date Beacon St service was routed into the subway, not a new physical line opening.", "opened": "1897-09-01", "segment": { "fromStopIndex": 17, "toStopIndex": 19 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260107102204/https://en.wikipedia.org/wiki/Green_Line_C_branch", "kind": "wikipedia", "quote": "The Tremont Street subway opened on September 1, 1897; Beacon Street service was routed into the Public Garden incline at the Public Garden, turning around at Park Street.", "tier": "tertiary", "title": "Green Line C branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_C_branch" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260531233717/https://en.wikipedia.org/wiki/Tremont_Street_subway", "kind": "other", "publisher": "Wikipedia", "quote": "opening on September 1, 1897", "tier": "tertiary", "title": "Tremont Street subway — Wikipedia", "url": "https://en.wikipedia.org/wiki/Tremont_Street_subway", "via": "https://en.wikipedia.org/wiki/Green_Line_C_branch" }, { "accessedAt": "2026-06-13", "kind": "other", "publisher": "Boston Street Railway Association", "quote": "Cited at p.57 for the statement that the Tremont Street subway opened on September 1, 1897, and Beacon Street service entered via the Public Garden incline.", "tier": "secondary", "title": "Tremont Street Subway: A Century of Public Service", "url": "https://archive.org/details/tremontstreetsub0000clar", "via": "https://en.wikipedia.org/wiki/Green_Line_C_branch" } ] }, { "confidence": "medium", "geometryRef": "boston-Green-C", "id": "boston-green-c-1914", "kind": "extension", "label": { "en": "Boylston Street subway opens (westward extension of Tremont Street subway); Beacon Street line enters just east of Kenmore Square via the Kenmore incline" }, "notes": "The Boylston Street subway is shared trunk infrastructure for multiple Green Line services, not exclusive to the C branch. No cleanly sourced construction-cost figure for this segment was found. [Opening-date chase 2026-06-13] Boylston Street subway article gives only '1914' (no day) but does not conflict with the October 3 date from the cited book.", "opened": "1914-10-03", "segment": { "fromStopIndex": 13, "toStopIndex": 17 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260107102204/https://en.wikipedia.org/wiki/Green_Line_C_branch", "kind": "wikipedia", "quote": "The Boylston Street subway opened on October 3, 1914, as a westward extension of the Tremont Street subway. The Beacon Street line entered just east of Kenmore Square.", "tier": "tertiary", "title": "Green Line C branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_C_branch" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611115302/https://en.wikipedia.org/wiki/Boylston_Street_subway", "kind": "wikipedia", "quote": "By 1914 the 'temporary' connection was made, and most of the street cars on Boylston began using the new tunnel.", "tier": "tertiary", "title": "Boylston Street subway — Wikipedia", "url": "https://en.wikipedia.org/wiki/Boylston_Street_subway" }, { "accessedAt": "2026-06-13", "kind": "other", "publisher": "Boston Street Railway Association", "quote": "Cited at p.57 for the statement that the Boylston Street subway opened on October 3, 1914.", "tier": "secondary", "title": "Tremont Street Subway: A Century of Public Service", "url": "https://archive.org/details/tremontstreetsub0000clar", "via": "https://en.wikipedia.org/wiki/Green_Line_C_branch" } ] }, { "confidence": "high", "geometryRef": "boston-Green-C", "id": "boston-green-c-1932", "kind": "extension", "label": { "en": "Underground Kenmore station opens (subway extended west under Kenmore Square); Beacon Street line surfaces via the new Saint Mary's Street incline" }, "notes": "Adds the underground Kenmore station (1 new station). The MBTA's own social post and Kenmore station Wikipedia both confirm the 23 Oct 1932 date. The St Mary's Street incline replaced the earlier surface approach. No sourced construction cost found for this extension. [Opening-date chase 2026-06-13] Kenmore station article (citing Belcher's MBTA service-change PDF) independently confirms October 23, 1932. MBTA Facebook primary post is blocked behind auth but its partial quote matches.", "opened": "1932-10-23", "segment": { "fromStopIndex": 12, "toStopIndex": 13 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260107102204/https://en.wikipedia.org/wiki/Green_Line_C_branch", "kind": "wikipedia", "quote": "On October 23, 1932, a westward extension of the subway was opened with an underground Kenmore station. It split into separate tunnels for the Commonwealth Avenue and Beacon Street lines; the latter surfaced at Saint Mary's Street.", "tier": "tertiary", "title": "Green Line C branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_C_branch" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611115554/https://www.facebook.com/plugins/post.php?href=https%3A%2F%2Fwww.facebook.com%2FTheMBTA%2Fposts%2Fonthisday-in-1932-kenmore-subway-station-opened-for-service-the-new-underground-%2F1285058003661568%2F", "kind": "primary", "quote": "#OnThisDay in 1932 Kenmore subway station opened for service. The new underground...", "tier": "primary", "title": "MBTA — #OnThisDay in 1932 Kenmore subway station opened for service", "url": "https://www.facebook.com/TheMBTA/posts/onthisday-in-1932-kenmore-subway-station-opened-for-service-the-new-underground-/1285058003661568/" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20250904171452/https://en.wikipedia.org/wiki/Kenmore_(MBTA_station)", "kind": "other", "publisher": "Wikipedia", "quote": "The subway station opened on October 23, 1932, replacing the former Kenmore Incline.", "tier": "tertiary", "title": "Kenmore (MBTA station) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Kenmore_(MBTA_station)", "via": "https://en.wikipedia.org/wiki/Green_Line_C_branch" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": null, "id": "boston-green-c-1940", "kind": "renumber", "label": { "en": "Beacon Street line assigned route number 61" }, "notes": "[Opening-date chase 2026-06-13] Administrative designation change (route number), not a revenue-service opening; year-only granularity is appropriate.", "opened": "1940", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260107102204/https://en.wikipedia.org/wiki/Green_Line_C_branch", "kind": "wikipedia", "quote": "From 1940 until its 1967 naming as the C branch, the Beacon Street line had route number 61.", "tier": "tertiary", "title": "Green Line C branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_C_branch" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-green-c-1967", "kind": "renumber", "label": { "en": "Beacon Street line (route 61) renamed the C branch under the new MBTA lettered branch scheme" }, "notes": "1967 is when the MBTA introduced the lettered (A–E) Green Line branch designations; the Beacon Street line became the 'C' branch. [Opening-date chase 2026-06-13] Administrative branch-letter naming, not a physical opening. A separate March 25, 1967 Lechmere extension is a different event and not this phase.", "opened": "1967", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260107102204/https://en.wikipedia.org/wiki/Green_Line_C_branch", "kind": "wikipedia", "quote": "From 1940 until its 1967 naming as the C branch, the Beacon Street line had route number 61.", "tier": "tertiary", "title": "Green Line C branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_C_branch" } ] } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260107102204/https://en.wikipedia.org/wiki/Green_Line_C_branch", "kind": "wikipedia", "quote": "The first tracks on Beacon Street were laid in 1888, running from Massachusetts Avenue west to Coolidge Corner.", "tier": "tertiary", "title": "Green Line C branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_C_branch" } ] }, { "cityId": "boston", "color": "#00843D", "displayNumber": "Green-D", "id": "boston-line-Green-D", "name": { "en": "Green Line D Branch" }, "phases": [ { "confidence": "high", "constructionStart": "1958", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "USD", "isEstimate": false, "value": 8000000, "year": 1959 }, "notes": "Final construction outturn 'Total construction costs came to $8 million.' Authorized ceiling was $9.2 million (June 20, 1957 legislative approval, covering purchase + conversion); the MTA bought the Highland branch from the Boston & Albany on June 24, 1958 for $600,000 (a separate acquisition cost). Construction began July 10, 1958. The line reused ~ten former B&A station sites, relocated Riverside and Woodland, and added one new station (Fenway); exact final station count varies by source. [Citation chase 2026-06-11] The exact $8M total rests solely on the Highland branch Wikipedia article, whose two underlying citations (Pittsburgh Press, Nov 15 1959 and Cheney/Sammarco 1999 p.129) could not be directly verified; primary MTA records (1958 Annual Report, 1957 Mass. Act ch.450) independently confirm only the $9.2M authorization ceiling and the $7.0M Perini main construction contract, so the $8M is best read as a reported construction outturn between those two figures.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611115822/https://en.wikipedia.org/wiki/Highland_branch", "kind": "wikipedia", "quote": "The MTA reopened the branch as the Riverside Line on July 4, 1959. ... Construction on the new light rail line began on July 10, 1958. ... Total construction costs came to $8 million. The state legislature approved the purchase and a total expenditure of $9.2 million on June 20, 1957. ... The MTA bought the Highland branch from the Boston and Albany on June 24, 1958 for $600,000.", "tier": "tertiary", "title": "Highland branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Highland_branch" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260512231641/https://en.wikipedia.org/wiki/Green_Line_D_branch", "kind": "wikipedia", "quote": "the state legislature authorized the Metropolitan Transit Authority (MTA) to acquire the Highland branch and convert it to rapid transit at a cost not to exceed $9.2 million ... Streetcar operation began on the converted Highland branch on July 4, 1959 ... 26,000 daily riders, versus 3,140 before conversion.", "tier": "tertiary", "title": "Green Line D branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_D_branch" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Metropolitan Transit Authority", "quote": "On June 9th, the Authority entered into a contract for the construction of the Highland Branch Extension which calls for the completion of the project by July 1, 1959. The cost of the project is being financed by a bond issue authorized by the Legislature and limiting the amount that can be expended to a sum not to exceed $9,200,000.00.", "tier": "primary", "title": "12th Annual Report (Year Ended – December 31, 1958) of the Board of Trustees of the Metropolitan Transit Authority", "url": "https://archive.org/details/annual-report-of-the-board-of-trustees-of-the-metropolitan-transit-authority-1958/page/7/mode/2up", "via": "https://en.wikipedia.org/wiki/Green_Line_D_branch" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Commonwealth of Massachusetts / Edward J. Cronin", "quote": "The authority may expend for the purposes of this section not exceeding nine million two hundred thousand dollars. No construction work shall be done under this section until a preliminary plan therefor, together with estimates of cost indicating that the project can be completed at a cost not exceeding nine million two hundred thousand dollars, shall have been approved by the commission of the department of public utilities.", "tier": "primary", "title": "Acts and Resolves Passed by the General Court of Massachusetts in the Year 1957 — Chapter 450: An Act Providing for Extension of Rapid Transit Facilities in the City of Boston, the Town of Brookline, and the City of Newton", "url": "https://archive.org/details/actsresolvespass1957mass/page/368", "via": "https://en.wikipedia.org/wiki/Green_Line_D_branch" } ] }, "geometryRef": "boston-Green-D", "id": "boston-green-d-1959", "kind": "initial", "label": { "en": "Riverside Line opens: Kenmore → Riverside (conversion of the B&A Highland Branch railroad to light rail)" }, "notes": "[Date chase 2026-06-12] Both Wikipedia sources are already cited on this phase and both trace the construction-start date to the underlying primary source Dana (1961), 'Riverside Line Extension, 1959,' Connecticut Valley Chapter NRHS Transportation Bulletin issue 65 — an offline periodical. The curated year 1958 is firmly supported (specific date: 1958-07-10). [Opening-date chase 2026-06-13] Belcher MBTA Route History PDF (directly fetched) explicitly lists July 4, 1959 as the Highland Branch opening; Pittsburgh Press (Nov 1959) is the inline citation behind the date. No separate ceremonial-vs-revenue offset.", "opened": "1959-07-04", "segment": { "fromStopIndex": 0, "toStopIndex": 19 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611115822/https://en.wikipedia.org/wiki/Highland_branch", "kind": "wikipedia", "quote": "The MTA reopened the branch as the Riverside Line on July 4, 1959. ... Construction on the new light rail line began on July 10, 1958. ... Total construction costs came to $8 million. The state legislature approved the purchase and a total expenditure of $9.2 million on June 20, 1957. ... The MTA bought the Highland branch from the Boston and Albany on June 24, 1958 for $600,000.", "tier": "tertiary", "title": "Highland branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Highland_branch" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260512231641/https://en.wikipedia.org/wiki/Green_Line_D_branch", "kind": "wikipedia", "quote": "the state legislature authorized the Metropolitan Transit Authority (MTA) to acquire the Highland branch and convert it to rapid transit at a cost not to exceed $9.2 million ... Streetcar operation began on the converted Highland branch on July 4, 1959 ... 26,000 daily riders, versus 3,140 before conversion.", "tier": "tertiary", "title": "Green Line D branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_D_branch" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20180612143942/https://www.newspapers.com/clip/20637896/boston_rides_old_rail_line_on_20c_fare/", "kind": "news", "publisher": "The Pittsburgh Press", "quote": "Cited inline (ref pp-19590608) for the July 4, 1959 reopening and ridership facts: \"Total construction costs came to $8 million. Daily ridership was 25,000, ten times what the B&A trains had carried at the end.\" (article dated November 15, 1959, Pittsburgh Press p. 43)", "tier": "secondary", "title": "Boston Rides Old Rail Line On 20c Fare", "url": "https://www.newspapers.com/clip/20637896/boston_rides_old_rail_line_on_20c_fare/", "via": "https://en.wikipedia.org/wiki/Highland_branch" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260601092329/http://roster.transithistory.org/MBTARouteHistory.pdf", "kind": "other", "publisher": "Boston Street Railway Association (Jonathan Belcher)", "quote": "July 4, 1959: The Highland Branch opened with stations Fenway Park, Longwood, Brookline Village, Brookline Hills, Beaconsfield, Reservoir, Chestnut Hill, Newton Center, Newton Highlands, Eliot, Waban, Woodland, and Riverside. The route was a former branch of the Boston & Albany railroad.", "tier": "secondary", "title": "Changes to Transit Service in the MBTA district", "url": "http://roster.transithistory.org/MBTARouteHistory.pdf", "via": "https://en.wikipedia.org/wiki/Green_Line_D_branch" } ], "stationCount": 13 }, { "confidence": "medium", "geometryRef": null, "id": "boston-green-d-1967", "kind": "renumber", "label": { "en": "Riverside Line redesignated as the Green Line 'D' branch (letter-designation of the five Green Line branches)" }, "notes": "[Opening-date chase 2026-06-13] Redesignation/rebranding event, not an infrastructure opening. Belcher PDF lists it under '1967:' with no month/day, so only year-level precision is available — consistent with the curated year-only date.", "opened": "1967", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260512231641/https://en.wikipedia.org/wiki/Green_Line_D_branch", "kind": "wikipedia", "quote": "In 1967, the five remaining Green Line branches were given letter designations; the Riverside Line became the D branch.", "tier": "tertiary", "title": "Green Line D branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_D_branch" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260601092329/http://roster.transithistory.org/MBTARouteHistory.pdf", "kind": "other", "publisher": "Boston Street Railway Association (Jonathan Belcher)", "quote": "1967: Letter coding was assigned to branches for use on maps and schedules (map numbers were no longer used): A Watertown, B Boston College, C Cleveland Circle, D Riverside, E Arborway", "tier": "secondary", "title": "Changes to Transit Service in the MBTA district", "url": "http://roster.transithistory.org/MBTARouteHistory.pdf", "via": "https://en.wikipedia.org/wiki/Green_Line_D_branch" } ] }, { "confidence": "high", "geometryRef": "boston-Green-D", "id": "boston-green-d-2022", "kind": "extension", "label": { "en": "Green Line Extension Union Square spur opens: Lechmere → Union Square" }, "notes": "GLX Union Square branch (D); opened 2022-03-21, ~3 months before the Medford branch. Segment also carries the GLX-era north subway (Govt Center → Lechmere → Union Square) on the D spine. Added during assembly — the research workflow recorded the GLX cost under the E/Medford phase, so no separate cost is carried here (avoids double-counting the shared GLX program cost). [Opening-date chase 2026-06-13] March 21, 2022 revenue opening confirmed by live MBTA project page (primary) and WBUR. Grand opening ceremony was same-day as revenue service (mid-to-late afternoon), not a prior-day ceremonial run. mass.gov press release URL is dead (403) but content corroborated by the live MBTA page.", "opened": "2022-03-21", "segment": { "fromStopIndex": 19, "toStopIndex": 24 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260519003620/https://en.wikipedia.org/wiki/Green_Line_Extension", "kind": "wikipedia", "quote": "The Union Square branch opened on March 21, 2022, followed by the Medford branch on December 12, 2022.", "tier": "tertiary", "title": "Green Line Extension — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_Extension" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20250707024159/https://www.mbta.com/projects/green-line-extension-glx/update/green-line-extension-glx-union-square-branch-opens-march", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "The Union Square Branch of the Green Line Extension (GLX) will open for service on March 21, 2022.", "tier": "primary", "title": "Green Line Extension (GLX) Union Square Branch Opens March 21", "url": "https://www.mbta.com/projects/green-line-extension-glx/update/green-line-extension-glx-union-square-branch-opens-march", "via": "https://en.wikipedia.org/wiki/Green_Line_Extension" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20230227204322/https://www.mass.gov/news/baker-polito-administration-celebrates-opening-of-the-green-line-extension", "kind": "primary", "publisher": "Government of Massachusetts", "quote": "Cited as ref 'mar21' in GLX Wikipedia article for the statement 'Service to Union Square began on March 21 as scheduled.' Press release dated March 21, 2022.", "tier": "primary", "title": "Baker-Polito Administration Celebrates Opening of the Green Line Extension", "url": "https://www.mass.gov/news/baker-polito-administration-celebrates-opening-of-the-green-line-extension", "via": "https://en.wikipedia.org/wiki/Green_Line_Extension" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20251020184513/https://www.wbur.org/news/2022/02/24/mbta-somerville-green-line-open", "kind": "news", "publisher": "WBUR", "quote": "March 21 will feature a 'grand opening ceremony' with revenue service beginning 'some time mid- to late afternoon.'", "tier": "secondary", "title": "Green Line Extension service to begin March 21", "url": "https://www.wbur.org/news/2022/02/24/mbta-somerville-green-line-open", "via": "https://en.wikipedia.org/wiki/Green_Line_Extension" } ], "stationCount": 1 } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260512231641/https://en.wikipedia.org/wiki/Green_Line_D_branch", "kind": "wikipedia", "quote": "the state legislature authorized the Metropolitan Transit Authority (MTA) to acquire the Highland branch and convert it to rapid transit at a cost not to exceed $9.2 million ... Streetcar operation began on the converted Highland branch on July 4, 1959 ... 26,000 daily riders, versus 3,140 before conversion.", "tier": "tertiary", "title": "Green Line D branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_D_branch" } ] }, { "cityId": "boston", "color": "#00843D", "displayNumber": "Green-E", "id": "boston-line-Green-E", "name": { "en": "Green Line E Branch" }, "phases": [ { "confidence": "high", "constructionStart": "1937", "cost": { "basis": "outturn", "confidence": "low", "nominal": { "currency": "USD", "isEstimate": false, "value": 7130000, "year": 1941 }, "notes": "Final construction cost of the Huntington Avenue Subway (WPA project): city paid $1.93M, federal government $5.20M. Wikipedia gives an inflation equivalent of ~$117M in 2025 dollars. This is the subway tunnel that the present-day E branch uses south of Copley; the E-branch designation itself dates to 1967. [Citation chase 2026-06-11] Direct source verification is blocked: the only citation tied to the $7.13M figure is a paywalled Feb 8, 1941 Boston Globe clip (Newspapers.com 54923110) that could not be read; the adjacent 1940 Boston Elevated Railway Annual Report supports only the subway's opening/physical details, not the cost. The figure is unverified beyond Wikipedia's own attribution.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "Construction began September 18, 1937 ... Opening February 16, 1941 ... Final cost: $7.13 million (equivalent to $117 million in 2025)", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, "geometryRef": "boston-Green-E", "id": "boston-green-e-1941", "kind": "initial", "label": { "en": "Huntington Avenue Subway opens: Copley Junction → Opera Place (Symphony), with Mechanics (Prudential) and Symphony underground stations" }, "notes": "[Date chase 2026-06-12] Wikipedia's stated 1937 start traces to Bradley H. Clarke, 'Streetcar Lines of the Hub – The 1940s' (2003, p.96), an offline book; a 1938 WPA bulletin on Internet Archive independently confirms construction was already underway by August 1938.", "opened": "1941-02-16", "segment": { "fromStopIndex": 9, "toStopIndex": 15 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "Construction began September 18, 1937 ... Opening February 16, 1941 ... Final cost: $7.13 million (equivalent to $117 million in 2025)", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" }, { "accessedAt": "2026-06-12", "kind": "primary", "publisher": "Works Progress Administration", "quote": "Enlarge Huntington Avenue Subway Project [August 10, 1938 — describes extension of an already-underway project, corroborates construction was active by mid-1938 but does not state a September 1937 start date]", "tier": "primary", "title": "Enlarge Huntington Avenue Subway Project — Works Progress Bulletin, August 10, 1938", "url": "https://archive.org/details/worksprogressbul3840unit/page/n44", "via": "https://en.wikipedia.org/wiki/Green_Line_E_branch" }, { "accessedAt": "2026-06-12", "kind": "other", "publisher": "Boston Street Railway Association", "quote": "[Wikipedia cites this book (Bradley H. Clarke, 2003, p. 96) as the primary source for 'Construction began on September 18, 1937' — book is offline]", "tier": "secondary", "title": "Streetcar Lines of the Hub – The 1940s, p. 96", "url": "offline:978-0938315056", "via": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ], "stationCount": 2 }, { "confidence": "low", "geometryRef": "boston-Green-E", "id": "boston-green-e-1945", "kind": "extension", "label": { "en": "Heath Street loop constructed; PCC streetcar terminus established on Huntington/South Huntington Avenue surface line" }, "opened": "1945-12-15", "segment": { "fromStopIndex": 15, "toStopIndex": 24 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "Constructed in 1945 to accommodate new PCC streetcars ... Route 57 extended to loop: December 15, 1945", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-green-e-1967", "kind": "renumber", "label": { "en": "Huntington Avenue line designated the Green Line 'E' branch (renumbering/relettering of the existing Arborway/Huntington Ave service)" }, "opened": "1967", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "Tremont Street routes designated Green Line in 1965; Huntington Avenue line became E branch in 1967.", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, { "closed": "1985-12-28", "confidence": "low", "geometryRef": null, "id": "boston-green-e-1985", "kind": "reopening", "label": { "en": "Arborway Line (Heath Street → Arborway surface segment) closed; service indefinitely replaced by route 39 bus, ending PCC streetcar operation" }, "opened": "1985-12-28", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "December 28, 1985, the Arborway Line was indefinitely replaced by route 39", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-green-e-1986", "kind": "reopening", "label": { "en": "Light rail vehicle service resumed on the E branch to Brigham Circle (replacing the temporary bus operation south of the subway)" }, "opened": "1986-07-26", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "July 26, 1986 service resumed to Brigham Circle", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, { "confidence": "low", "geometryRef": "boston-Green-E", "id": "boston-green-e-1987", "kind": "extension", "label": { "en": "E branch (Brigham Circle service) extended north through the central subway to Lechmere; Type 7 LRVs introduced" }, "opened": "1987-06-20", "segment": { "fromStopIndex": 5, "toStopIndex": 9 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "June 20, 1987, all Brigham Circle service was extended to Lechmere", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-green-e-1989", "kind": "reopening", "label": { "en": "E branch surface service restored from Brigham Circle to Heath Street (south end reopened after street trackage replacement); route 39 bus retained south of Heath Street" }, "opened": "1989-11-04", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "Heath Street service resumed on November 4, 1989, but route 39 buses continued to provide all service south of Heath Street.", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, { "closed": "2020-05-24", "confidence": "low", "geometryRef": null, "id": "boston-green-e-2020", "kind": "reopening", "label": { "en": "E branch cut back from Lechmere to North Station for Green Line Extension construction; original Lechmere station closed" }, "notes": "[Opening-date chase 2026-06-13] Wikipedia internal day-level discrepancy: narrative says May 24, 2020 (service cutback); station table says May 23, 2020 (Lechmere surface station last day). Likely last-service vs first-closed-day; year 2020 unaffected.", "opened": "2020-05-24", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "May 24, 2020: Service cut back from Lechmere to North Station for Green Line Extension construction.", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, { "confidence": "high", "constructionStart": "2018", "cost": { "basis": "budget", "confidence": "high", "nominal": { "currency": "USD", "isEstimate": false, "value": 2280000000, "year": 2014 }, "notes": "Total cost of the ENTIRE Green Line Extension project (both the Medford Branch carrying the E branch AND the Union Square Branch carrying the D branch, plus the rebuilt Lechmere station and viaduct) — NOT the Medford segment alone. $0.996B federal + $1.28B state/other. FFGA (signed January 2015) gave $2.3B in 2014 dollars. Main groundbreaking June 25, 2018; original groundbreaking December 11, 2012; the new (rebuilt elevated) Lechmere station is shared between the two branches. Medford Branch added 5 new stations plus the relocated Lechmere terminus. [Citation chase 2026-06-11] The $2.28B is the FFGA \"newly revised budget\" per the MassDOT GLX page (an authorized budget, not a final audited outturn); the MBTA's Dec 12 2022 opening press release rounds it to $2.3 billion.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260519003620/https://en.wikipedia.org/wiki/Green_Line_Extension", "kind": "wikipedia", "quote": "Medford Branch: December 12, 2022 ... 5 stations: East Somerville, Gilman Square, Magoun Square, Ball Square, Medford/Tufts ... Plus Lechmere station (shared terminus) ... Total project cost was estimated to be $2.28 billion: $0.996 billion from the federal government and $1.28 billion from state and other sources.", "tier": "tertiary", "title": "Green Line Extension — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_Extension" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "December 12, 2022: Medford Branch revenue service began, making E branch run from Medford/Tufts to Heath Street", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Massachusetts Department of Transportation (MassDOT) via Internet Archive", "quote": "federal dollars will fund approximately $996 million of the newly revised budget of $2.28 billion", "tier": "secondary", "title": "About the Green Line Extension Project (archived)", "url": "https://web.archive.org/web/20211125064456/https://www.mass.gov/info-details/about-the-green-line-extension-project", "via": "https://en.wikipedia.org/wiki/Green_Line_Extension" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20251012193321/https://www.mbta.com/news/2022-12-12/mbta-celebrates-opening-the-green-line-extension-medford-branch", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "The $2.3 billion project extends the Green Line approximately 4.7 miles along two branches", "tier": "secondary", "title": "MBTA Celebrates Opening of the Green Line Extension Medford Branch", "url": "https://www.mbta.com/news/2022-12-12/mbta-celebrates-opening-the-green-line-extension-medford-branch", "via": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, "geometryRef": "boston-Green-E", "id": "boston-green-e-2022", "kind": "extension", "label": { "en": "Green Line Extension Medford Branch opens: Lechmere → Medford/Tufts (East Somerville, Gilman Square, Magoun Square, Ball Square, Medford/Tufts); E branch extended from Heath Street to Medford/Tufts" }, "notes": "[Date chase 2026-06-12] Main GLX construction began 2018 (formal groundbreaking June 25, 2018; NTP issued Dec 2017 after FTA released initial funding). A separate 2012 Phase 1 bridge reconstruction/demolition preceded this; the curated 2018 date correctly reflects the main design-build construction contract, not the earlier 2012 enabling work.", "opened": "2022-12-12", "segment": { "fromStopIndex": 0, "toStopIndex": 5 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260519003620/https://en.wikipedia.org/wiki/Green_Line_Extension", "kind": "wikipedia", "quote": "Medford Branch: December 12, 2022 ... 5 stations: East Somerville, Gilman Square, Magoun Square, Ball Square, Medford/Tufts ... Plus Lechmere station (shared terminus) ... Total project cost was estimated to be $2.28 billion: $0.996 billion from the federal government and $1.28 billion from state and other sources.", "tier": "tertiary", "title": "Green Line Extension — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_Extension" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "December 12, 2022: Medford Branch revenue service began, making E branch run from Medford/Tufts to Heath Street", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260530040843/https://www.wbur.org/news/2018/06/25/green-line-extension-groundbreaking", "kind": "news", "publisher": "WBUR", "quote": "Officials broke ground Monday on the long-delayed MBTA Green Line Extension into Somerville and Medford.", "tier": "secondary", "title": "Officials Break Ground On Green Line Extension — WBUR", "url": "https://www.wbur.org/news/2018/06/25/green-line-extension-groundbreaking", "via": "https://en.wikipedia.org/wiki/Green_Line_Extension" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20241031174520/https://www.mbta.com/news/2017-12-21/federal-funds-issued-mbta-green-line-extension-project", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority", "quote": "[Wikipedia states: 'The FTA released the first $100 million in funding in December 2017, allowing the MBTA to issue a notice to proceed for the main construction contract' — establishes NTP in Dec 2017 immediately preceding 2018 construction]", "tier": "primary", "title": "Federal Funds Issued for MBTA Green Line Extension Project — MBTA press release, December 21, 2017", "url": "https://www.mbta.com/news/2017-12-21/federal-funds-issued-mbta-green-line-extension-project", "via": "https://en.wikipedia.org/wiki/Green_Line_Extension" } ], "stationCount": 6 } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260513083117/https://en.wikipedia.org/wiki/Green_Line_E_branch", "kind": "wikipedia", "quote": "Construction began September 18, 1937 ... Opening February 16, 1941 ... Final cost: $7.13 million (equivalent to $117 million in 2025)", "tier": "tertiary", "title": "Green Line E branch — Wikipedia", "url": "https://en.wikipedia.org/wiki/Green_Line_E_branch" } ] }, { "cityId": "boston", "color": "#7C878E", "displayNumber": "Silver-SL1", "id": "boston-line-Silver-SL1", "name": { "en": "Silver Line SL1" }, "phases": [ { "confidence": "high", "constructionStart": "1995", "cost": { "basis": "outturn", "confidence": "high", "nominal": { "currency": "USD", "isEstimate": false, "value": 624000000, "year": 2004 }, "notes": "Final outturn cost of the ENTIRE South Boston Piers Transitway tunnel (shared infrastructure for SL1, SL2 and SL3 — not the SL1 route alone). Original November 1994 FFGA projected a $413M total cost with $331M (80%) federal; by 2000 the estimate had risen to $601M; final cost to the MBTA was $624M. Price-level year of the $624M figure not explicitly stated (taken as completion year 2004). Stations on this segment: South Station, Courthouse, World Trade Center, Silver Line Way (4). [Citation chase 2026-06-11] The FTA 2007 Evaluation gives the more precise figure of $624.2M as the total project cost as of August 2006, after legal claims were settled — confirming the $624M is a final outturn rather than an estimate.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "Environmental documentation was filed in 1998, and construction began in 2001.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The Transitway opened on December 17, 2004, with the Waterfront shuttle route between South Station and Silver Line operated by a mix of new dual-mode buses and 40-foot (12 m) trolleybuses borrowed from the Harvard-based routes.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The Transitway was ultimately completed in 2004, with a final cost to the MBTA of $624 million.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20250830224204/https://www.govinfo.gov/content/pkg/GAOREPORTS-GAO-01-174R/html/GAOREPORTS-GAO-01-174R.htm", "kind": "primary", "quote": "the federal government would provide $331 million (80 percent) of the projected $413 million total cost ... its estimated total cost has risen to $601 million", "tier": "primary", "title": "Mass Transit: Review of the South Boston Piers Transitway Finance Plan (GAO-01-174R)", "url": "https://www.govinfo.gov/content/pkg/GAOREPORTS-GAO-01-174R/html/GAOREPORTS-GAO-01-174R.htm" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20250605003217/https://www.transit.dot.gov/sites/fta.dot.gov/files/FINALBOSTONBRTREPORT062507.pdf", "kind": "primary", "publisher": "Federal Transit Administration", "quote": "As of August 2006, the total project costs were $624.2 million after some legal claims were settled.", "tier": "secondary", "title": "Silver Line Waterfront Bus Rapid Transit (BRT): 2007 Evaluation", "url": "https://www.transit.dot.gov/sites/fta.dot.gov/files/FINALBOSTONBRTREPORT062507.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Federal Transit Administration via Internet Archive", "quote": "As of August 2006, the total project costs were $624.2 million after some legal claims were settled.", "tier": "secondary", "title": "Silver Line Waterfront Bus Rapid Transit (BRT): 2007 Evaluation (archived)", "url": "https://web.archive.org/web/20230101/https://www.transit.dot.gov/sites/fta.dot.gov/files/FINALBOSTONBRTREPORT062507.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, "geometryRef": null, "id": "boston-silver-sl1-2004", "kind": "initial", "label": { "en": "Waterfront Transitway (South Boston Piers Transitway) opens: South Station → Silver Line Way (bus tunnel infrastructure later used by SL1; initial Waterfront shuttle service)" }, "notes": "[Date chase 2026-06-12] constructionStart corrected from 2001 to 1995: the 2001 value derives from a Wikipedia quote about the Washington Street corridor (Phase I / SL4-SL5), not the Waterfront Transitway that SL1 uses. Boston Globe (Nov 22 2004) Phase II sidebar gives 'construction in 1995'; GAO-01-174R (Nov 1994 full-funding grant, Dec 2000 completion target, contracts 25-72% complete by Sept 2000) and Wikipedia's Waterfront section ('construction already under way' by 1997) corroborate a 1995 start. Construction-start corrected 2001→1995 [Date chase 2026-06-12 — panel-confirmed, corrected w/ sign-off] [Opening-date chase 2026-06-13] This was the Waterfront shuttle revenue opening of the Transitway infrastructure; SL2/SL3 through service to Waterfront/City Point began two weeks later on December 31, 2004. No separate ceremonial opening preceded the December 17 revenue service.", "opened": "2004-12-17", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "Environmental documentation was filed in 1998, and construction began in 2001.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The Transitway opened on December 17, 2004, with the Waterfront shuttle route between South Station and Silver Line operated by a mix of new dual-mode buses and 40-foot (12 m) trolleybuses borrowed from the Harvard-based routes.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The Transitway was ultimately completed in 2004, with a final cost to the MBTA of $624 million.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20250830224204/https://www.govinfo.gov/content/pkg/GAOREPORTS-GAO-01-174R/html/GAOREPORTS-GAO-01-174R.htm", "kind": "primary", "quote": "the federal government would provide $331 million (80 percent) of the projected $413 million total cost ... its estimated total cost has risen to $601 million", "tier": "primary", "title": "Mass Transit: Review of the South Boston Piers Transitway Finance Plan (GAO-01-174R)", "url": "https://www.govinfo.gov/content/pkg/GAOREPORTS-GAO-01-174R/html/GAOREPORTS-GAO-01-174R.htm" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20251117020936/http://archive.boston.com/news/local/articles/2004/11/22/bus_tunnel_to_open_but_waterfront_boom_lags?pg=full", "kind": "news", "publisher": "Boston Globe", "quote": "Design began in 1990, construction in 1995; original promised completion date was 2003, now end of 2004 [from 'Hi ho silver: Key facts about Silver Line Phase II' sidebar]", "tier": "secondary", "title": "Bus tunnel to open, but waterfront boom lags — The Boston Globe", "url": "https://archive.boston.com/news/local/articles/2004/11/22/bus_tunnel_to_open_but_waterfront_boom_lags?pg=full", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ], "stationCount": 4 }, { "confidence": "low", "geometryRef": null, "id": "boston-silver-sl1-2005", "kind": "extension", "label": { "en": "Silver Line Connector interim shuttle begins: Silver Line Way → Logan Airport (Sunday-only diesel-bus shuttle, transfer at Silver Line Way)" }, "notes": "[Opening-date chase 2026-06-13] This was a distinct interim phase: a Sunday-only diesel-bus shuttle with transfer at Silver Line Way, not the full SL1 dual-mode through-service (which began June 1, 2005). Started to meet a legal commitment to begin airport service that month.", "opened": "2005-01-02", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "Two days later, a Sunday-only Silver Line Way-Logan Airport shuttle service called 'Silver Line Connector' began operation to meet a legal commitment to begin airport service that month.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251118074628/https://en.wikipedia.org/wiki/Silver_Line_Way_station", "kind": "wikipedia", "quote": "Silver Line Way served as the transfer point between these services and diesel buses to Logan Airport beginning in January 2005.", "tier": "tertiary", "title": "Silver Line Way station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_Way_station" } ] }, { "confidence": "medium", "geometryRef": null, "id": "boston-silver-sl1-2005-2", "kind": "extension", "label": { "en": "SL1 through-service to Logan Airport begins: South Station → Logan Airport terminals (via Waterfront Transitway, dual-mode buses; airport terminal stops added)" }, "notes": "[Opening-date chase 2026-06-13] Full SL1 through-service to Logan Airport; superseded the January 2005 Sunday-only interim shuttle. Buses were freed for SL1 when SL2/3 routes were combined at all times on May 28, 2005.", "opened": "2005-06-01", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On June 1, 2005, the two routes were combined at all times as the SL2/3. This freed up buses for SL1 service to Logan Airport, which began on June 1.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251118074628/https://en.wikipedia.org/wiki/Silver_Line_Way_station", "kind": "wikipedia", "quote": "SL1 through service began on June 1, 2005.", "tier": "tertiary", "title": "Silver Line Way station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_Way_station" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260412180725/https://www.newspapers.com/article/the-boston-globe/192032260/", "kind": "news", "publisher": "The Boston Globe", "quote": "Article dated June 2, 2005 (day after launch), reporting on SL1 service to Logan Airport beginning.", "tier": "secondary", "title": "Silver Line brightens trip for airport-bound travelers — The Boston Globe", "url": "https://www.newspapers.com/article/the-boston-globe/192032260/", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ], "stationCount": 5 } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "Environmental documentation was filed in 1998, and construction began in 2001.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, { "cityId": "boston", "color": "#7C878E", "displayNumber": "Silver-SL2", "id": "boston-line-Silver-SL2", "name": { "en": "Silver Line SL2" }, "phases": [ { "confidence": "high", "constructionStart": "1995", "cost": { "basis": "outturn", "confidence": "high", "nominal": { "currency": "USD", "isEstimate": false, "value": 624000000, "year": 2004 }, "notes": "Final cost of the ENTIRE South Boston Piers Transitway (the underground busway with stations at Courthouse, World Trade Center, Silver Line Way plus the South Station connection), shared by SL1 and SL2 (and the former SL3) — NOT the SL2 surface segment alone. Project ran heavily over budget: original first phase budgeted ~$413M (FTA funding $331M / 80% approved Nov 1994); by late 2000 it was ~3 years behind and almost $200M over budget, ending at ~$624M. Some secondary sources round to ~$625M. [Citation chase 2026-06-11] A primary FTA source (Silver Line Waterfront BRT: 2007 Evaluation) reports total project costs of $624.2M as of August 2006 after legal claims were settled — confirming $624M as the actual final (outturn) cost; the MBTA expected the figure to settle near $618.8M once all claims fully resolved.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On December 31, 2004, service began on routes SL2 to the Boston Marine Industrial Park", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The Transitway was ultimately completed in 2004, with a final cost to the MBTA of $624 million.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The FTA agreed to fund $331 million (80%) of the $413 million first phase ... By late 2000, the project was three years behind schedule and almost $200 million over budget.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251118074628/https://en.wikipedia.org/wiki/Silver_Line_Way_station", "kind": "wikipedia", "quote": "The South Boston Piers Transitway between South Station and Silver Line Way opened on December 17, 2004 ... SL2 and SL3 through service to the Waterfront and City Point areas began on December 31, 2004", "tier": "tertiary", "title": "Silver Line Way station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_Way_station" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20250605003217/https://www.transit.dot.gov/sites/fta.dot.gov/files/FINALBOSTONBRTREPORT062507.pdf", "kind": "primary", "publisher": "Federal Transit Administration", "quote": "As of August 2006, the total project costs were $624.2 million after some legal claims were settled. The MBTA still feels that the cost to complete for the project will be $618.8 million when all legal claims are resolved.", "tier": "primary", "title": "Silver Line Waterfront Bus Rapid Transit (BRT): 2007 Evaluation", "url": "https://www.transit.dot.gov/sites/fta.dot.gov/files/FINALBOSTONBRTREPORT062507.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Federal Transit Administration", "quote": "As of August 2006, the total project costs were $624.2 million after some legal claims were settled.", "tier": "primary", "title": "Silver Line Waterfront Bus Rapid Transit (BRT): 2007 Evaluation (Wayback Machine archive)", "url": "https://web.archive.org/web/20240402234600/https://www.transit.dot.gov/sites/fta.dot.gov/files/FINALBOSTONBRTREPORT062507.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20210128092931/https://www.gao.gov/assets/100/90177.pdf", "kind": "primary", "publisher": "General Accounting Office", "quote": "In November 1994, the Federal Transit Administration (FTA) entered into a full funding grant agreement with MBTA, under which the federal government would provide $331 million (80 percent) of the projected $413 million total cost for the project's first phase, which was to be completed in December 2000. ... currently, the project is 3 years behind schedule and its estimated total cost has risen to $601 million.", "tier": "primary", "title": "Mass Transit: Review of the South Boston Piers Transitway Finance Plan (GAO-01-174R)", "url": "https://www.gao.gov/assets/100/90177.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "General Accounting Office", "quote": "The first phase of the South Boston Piers Transitway project is now expected to cost $601 million—a $188 million increase (46 percent) over the $413 million projected in the 1994 full funding grant agreement.", "tier": "primary", "title": "Mass Transit: Review of the South Boston Piers Transitway Finance Plan (GAO-01-174R) (Wayback Machine archive)", "url": "https://web.archive.org/web/20230405010145/https://www.gao.gov/assets/100/90177.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, "geometryRef": null, "id": "boston-silver-sl2-2004", "kind": "initial", "label": { "en": "SL2 opens: South Station → Boston Marine Industrial Park (Design Center) via the South Boston Piers Transitway" }, "notes": "[Date chase 2026-06-12] FTA 2007 BRT Evaluation Report confirms Transitway construction began in 1995 after a five-year planning process; Full Funding Grant Agreement executed 1994 and state environmental review completed April 18, 1995, immediately preceding construction. Full opening slipped from 2000 to 2005, a ~10-year construction period. [Opening-date chase 2026-06-13] Dec 17, 2004 was an interim tunnel opening with a limited shuttle; full SL2 revenue service began Dec 31, 2004. FTA Washington Street evaluation labels the Phase II opening as 'interim,' corroborating the partial-then-full distinction.", "opened": "2004-12-31", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On December 31, 2004, service began on routes SL2 to the Boston Marine Industrial Park", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The Transitway was ultimately completed in 2004, with a final cost to the MBTA of $624 million.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The FTA agreed to fund $331 million (80%) of the $413 million first phase ... By late 2000, the project was three years behind schedule and almost $200 million over budget.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251118074628/https://en.wikipedia.org/wiki/Silver_Line_Way_station", "kind": "wikipedia", "quote": "The South Boston Piers Transitway between South Station and Silver Line Way opened on December 17, 2004 ... SL2 and SL3 through service to the Waterfront and City Point areas began on December 31, 2004", "tier": "tertiary", "title": "Silver Line Way station — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_Way_station" }, { "accessedAt": "2026-06-12", "kind": "primary", "publisher": "Federal Transit Administration (via Internet Archive)", "quote": "After a five-year planning process, construction began in 1995. However, the full project opening was delayed from 2000 to 2005, resulting in a 10-year construction period. The construction difficulties led to an increase in total project cost from $413 million in the original Full Funding Grant Agreement to the current estimate of $619 million.", "tier": "primary", "title": "Silver Line Waterfront Bus Rapid Transit (BRT): 2007 Evaluation (archived)", "url": "https://web.archive.org/web/20230101000000/https://www.transit.dot.gov/sites/fta.dot.gov/files/FINALBOSTONBRTREPORT062507.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20251230003330/https://nbrti.org/wp-content/uploads/2017/05/Boston_Silver_Line_final_report.pdf", "kind": "primary", "publisher": "Federal Transit Administration", "quote": "Phase II of the project, which had an interim opening on December 17, 2004, was covered in the Data Collection Plan, but will be the subject of a separate evaluation report.", "tier": "primary", "title": "Boston Silver Line Washington Street Bus Rapid Transit (BRT): Demonstration Project Evaluation (FTA, September 2005)", "url": "https://nbrti.org/wp-content/uploads/2017/05/Boston_Silver_Line_final_report.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ], "stationCount": 4 }, { "confidence": "low", "geometryRef": null, "id": "boston-silver-sl2-2009", "kind": "renumber", "label": { "en": "SL2 terminus renamed to 'Design Center' (no service change)" }, "notes": "[Opening-date chase 2026-06-13] This is a terminus rename only (no service alteration); not a new service opening.", "opened": "2009-10", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "In October 2009, the SL2 terminus was renamed 'Design Center' with no changes in service.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On December 31, 2004, service began on routes SL2 to the Boston Marine Industrial Park", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, { "cityId": "boston", "color": "#7C878E", "displayNumber": "Silver-SL3", "id": "boston-line-Silver-SL3", "name": { "en": "Silver Line SL3" }, "phases": [ { "confidence": "low", "geometryRef": null, "id": "boston-silver-sl3-2004", "kind": "initial", "label": { "en": "Original SL3 opens: South Station ↔ City Point (via Northern Ave, Drydock Ave, Summer St)" }, "notes": "This is the ORIGINAL/first SL3 service (South Boston Waterfront/City Point), entirely distinct from the current Chelsea SL3. It shared most of its route with SL2 (Waterfront Tunnel busway from South Station). Opened same day as SL2 to Boston Marine Industrial Park. [Opening-date chase 2026-06-13] The South Station–Silver Line Way Transitway opened earlier on Dec 17, 2004 as a shuttle; Dec 31, 2004 is correct for SL3 specifically reaching City Point.", "opened": "2004-12-31", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On December 31, 2004, service began on routes SL2 to the Boston Marine Industrial Park and route SL3 to City Point – the latter running via Northern Avenue, Drydock Avenue, and Summer Street.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-silver-sl3-2005", "kind": "extension", "label": { "en": "Original SL3 extended: City Point → Farragut Road loop (weekday service)" }, "notes": "Weekday-only extension of the original City Point SL3 to a loop on Farragut Road. Short-lived; the loop was cut four months later (see next phase).", "opened": "2005-04-09", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On April 9, weekday SL3 service was extended from City Point to a loop on Farragut Road.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, { "closed": "2005-08-20", "confidence": "low", "geometryRef": null, "id": "boston-silver-sl3-2005-2", "kind": "renumber", "label": { "en": "Original SL3 Farragut Road loop cut (service reverts to City Point)" }, "notes": "Partial closure: the Farragut Road loop added in April 2005 was eliminated due to resident noise complaints; SL3 reverted to terminating at City Point. Classified as a service-extent change (not a full reopening); no full line closure. Date per English Wikipedia. [Opening-date chase 2026-06-13] This phase records a service contraction (loop cut, reversion to City Point), not a service opening, but the event date is correct.", "opened": "2005-08-20", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On August 20, and the Farragut Road loop was cut due to noise complaints from residents.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, { "closed": "2009-03-20", "confidence": "low", "geometryRef": null, "id": "boston-silver-sl3-2009", "kind": "renumber", "label": { "en": "Original SL3 (City Point) discontinued; service folded into SL2" }, "notes": "The original City Point SL3 was discontinued entirely due to very low ridership (under 1 passenger per trip by 2008 on the non-shared segment); SL2 frequency was increased to replace it. The SL3 designation was later reused for the unrelated Chelsea service in 2018. [Opening-date chase 2026-06-13] This phase records a discontinuation, not an opening; the date is correct for the event.", "opened": "2009-03-20", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "By 2008, the SL3 averaged less than one passenger per trip on the segment not shared with the SL2. On March 20, 2009, SL3 service was cut, with SL2 service increased in its stead.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, { "confidence": "medium", "constructionStart": "2015", "cost": { "basis": "outturn", "confidence": "high", "nominal": { "currency": "USD", "isEstimate": false, "value": 56700000, "year": 2018 }, "notes": "Total Silver Line Gateway (SL3-Chelsea) construction investment: $56.7M, jointly funded MBTA ~$49.1M + MassDOT ~$7.6M. A $33.8M construction contract was approved Sep 2014 (per Chelsea station Wikipedia); the $56.7M is the full project investment per the MBTA/MassDOT announcement. Covers dedicated busways + 4 new Chelsea stations; the new SL3 also uses 5 existing Silver Line stations in Boston.", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251116222555/https://www.mbta.com/news/2018-03-12/new-silver-line-3-chelsea-service-between-chelsea-and-south-station", "kind": "primary", "quote": "Construction of the SL3-Chelsea route began in March 2015 with construction of dedicated busways and four new stations. ... Construction of this $56.7 million investment was managed by MassDOT's Highway Division and jointly funded by the MBTA (approximately $49.1 million) and MassDOT ($7.6 million).", "tier": "primary", "title": "New Silver Line 3-Chelsea Service between Chelsea and South Station — MBTA News", "url": "https://www.mbta.com/news/2018-03-12/new-silver-line-3-chelsea-service-between-chelsea-and-south-station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251116222555/https://www.mbta.com/news/2018-03-12/new-silver-line-3-chelsea-service-between-chelsea-and-south-station", "kind": "primary", "quote": "The MBTA is pleased to announce the brand new Silver Line 3-Chelsea route will operate between South Station and the Chelsea and East Boston communities beginning Saturday, April 21, 2018.", "tier": "primary", "title": "New Silver Line 3-Chelsea Service between Chelsea and South Station — MBTA News", "url": "https://www.mbta.com/news/2018-03-12/new-silver-line-3-chelsea-service-between-chelsea-and-south-station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "A separate SL3 route to Chelsea – originally planned as part of the cancelled Urban Ring Project – began service on April 21, 2018.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251222011512/https://en.wikipedia.org/wiki/Chelsea_station_(MBTA)", "kind": "wikipedia", "quote": "A $33.8 million construction contract was approved in September 2014, and construction began in March 2015. ... Silver Line service to Chelsea on the SL3 route began on April 21, 2018.", "tier": "tertiary", "title": "Chelsea station (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Chelsea_station_(MBTA)" } ] }, "geometryRef": null, "id": "boston-silver-sl3-2018", "kind": "reopening", "label": { "en": "New SL3 (Silver Line Gateway) opens: South Station → Chelsea (4 new Chelsea stations)" }, "notes": "The SL3 designation was reused in 2018 for an entirely separate route to Chelsea via the Ted Williams Tunnel, originally planned as part of the cancelled Urban Ring Project — hence 'reopening' of the SL3 label rather than a true continuation of the City Point service. Construction began March 2015. Four new stations built in Chelsea (Eastern Avenue, Box District, Bellingham Square, Chelsea/Mystic Mall-area; later Chelsea station). Note: a separate, relocated Chelsea Commuter Rail station ($37.7M project, $32.4M contract awarded Apr 2019, construction Aug 2019) opened Nov 15, 2021 replacing Bellingham Square platforms — that is a commuter-rail relocation adjacent to the SL3 stop, not a new SL3 service phase. [Date chase 2026-06-12] Construction start (March 2015) is corroborated by the Chelsea station (MBTA) Wikipedia article, chased via the Silver Line (MBTA) line article; that article cites two dead MassDOT/blog.mass.gov press releases inline, but the live MBTA press release independently confirms the same month and year. The Silver Line (MBTA) line-level article itself contains no SL3-Chelsea construction-start date.", "opened": "2018-04-21", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251116222555/https://www.mbta.com/news/2018-03-12/new-silver-line-3-chelsea-service-between-chelsea-and-south-station", "kind": "primary", "quote": "Construction of the SL3-Chelsea route began in March 2015 with construction of dedicated busways and four new stations. ... Construction of this $56.7 million investment was managed by MassDOT's Highway Division and jointly funded by the MBTA (approximately $49.1 million) and MassDOT ($7.6 million).", "tier": "primary", "title": "New Silver Line 3-Chelsea Service between Chelsea and South Station — MBTA News", "url": "https://www.mbta.com/news/2018-03-12/new-silver-line-3-chelsea-service-between-chelsea-and-south-station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251116222555/https://www.mbta.com/news/2018-03-12/new-silver-line-3-chelsea-service-between-chelsea-and-south-station", "kind": "primary", "quote": "The MBTA is pleased to announce the brand new Silver Line 3-Chelsea route will operate between South Station and the Chelsea and East Boston communities beginning Saturday, April 21, 2018.", "tier": "primary", "title": "New Silver Line 3-Chelsea Service between Chelsea and South Station — MBTA News", "url": "https://www.mbta.com/news/2018-03-12/new-silver-line-3-chelsea-service-between-chelsea-and-south-station" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "A separate SL3 route to Chelsea – originally planned as part of the cancelled Urban Ring Project – began service on April 21, 2018.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251222011512/https://en.wikipedia.org/wiki/Chelsea_station_(MBTA)", "kind": "wikipedia", "quote": "A $33.8 million construction contract was approved in September 2014, and construction began in March 2015. ... Silver Line service to Chelsea on the SL3 route began on April 21, 2018.", "tier": "tertiary", "title": "Chelsea station (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Chelsea_station_(MBTA)" } ], "stationCount": 4 } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On December 31, 2004, service began on routes SL2 to the Boston Marine Industrial Park and route SL3 to City Point – the latter running via Northern Avenue, Drydock Avenue, and Summer Street.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, { "cityId": "boston", "color": "#7C878E", "displayNumber": "Silver-SL4", "id": "boston-line-Silver-SL4", "name": { "en": "Silver Line SL4" }, "phases": [ { "confidence": "medium", "geometryRef": null, "id": "boston-silver-sl4-2009", "kind": "initial", "label": { "en": "SL4 service introduced: Dudley (now Nubian) → South Station (surface route along Washington St / Essex St); original Washington Street Silver Line rebranded SL5" }, "notes": "SL4 is a bus rapid transit route, not a rail extension. It was created as a surface partial substitute after the cancelled Phase III tunnel that would have connected the Washington Street (Phase I) and Waterfront (Phase II) corridors. SL4 runs north on Washington Street from Dudley/Nubian, sharing the Washington Street busway with SL5 between Dudley/Nubian and Tufts Medical Center, then continues to Chinatown and east on Essex Street (dedicated lane) to a surface terminus across Atlantic Avenue from South Station. When SL4 began, the pre-existing Washington Street Silver Line (opened 20 July 2002, Phase I) was redesignated SL5. The southern terminus station 'Dudley' was renamed 'Nubian' effective June 2020 (square renamed Dec 2019; MBTA agreed Feb 2020) — a station rename, not a construction phase, so not listed as a separate phase here. Sources agree on the 13 October 2009 date. [Opening-date chase 2026-06-13] Day-level source conflict on the SL4 launch: Wikipedia states Oct 13, 2009 but attributes it to the Belcher MBTA Route History PDF, which actually states Oct 15, 2009 (Thursday); both archived Belcher versions agree on Oct 15. Year (2009) is not in dispute.", "opened": "2009-10-13", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611120943/https://www.liquisearch.com/silver_line_mbta/history/the_silver_line", "kind": "wikipedia", "quote": "A partial solution that did not require a new tunnel opened on October 13, 2009, after fast-track construction using federal stimulus money. The new route, SL4, covers much of the same ground as the proposed Phase III in a dedicated bus lane on the surface that terminates across Atlantic Avenue from South Station, allowing a somewhat circuitous pedestrian transfer between Phase I and Phase II.", "tier": "tertiary", "title": "Silver Line (MBTA) — History — The Silver Line (Liquisearch, mirroring Wikipedia)", "url": "https://www.liquisearch.com/silver_line_mbta/history/the_silver_line" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611120943/https://www.liquisearch.com/silver_line_mbta/history/the_silver_line", "kind": "wikipedia", "quote": "When SL4 began operation, the existing Silver Line Washington Street service was rebranded SL5.", "tier": "tertiary", "title": "Silver Line (MBTA) — History — The Silver Line (Liquisearch, mirroring Wikipedia)", "url": "https://www.liquisearch.com/silver_line_mbta/history/the_silver_line" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The SL4 runs north on Washington Street to Chinatown, then east on Essex Street (with a dedicated lane) to a surface stop at South Station.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "In February 2020, the MBTA agreed to change the name of Dudley Square station to Nubian, following the December 2019 renaming of the square itself...The station renaming took effect in June 2020.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-13", "kind": "primary", "publisher": "Boston Street Railway Association", "quote": "On October 15, 2009, an additional Silver Line Washington St. service was added operating from Dudley to South Station, designated as Route SL4 Dudley-South Station.", "tier": "secondary", "title": "Changes to Transit Service in the MBTA district — archived April 4, 2026 version (Belcher, Boston Street Railway Association)", "url": "https://web.archive.org/web/20260528100638/http://roster.transithistory.org/MBTARouteHistory.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260611120943/https://www.liquisearch.com/silver_line_mbta/history/the_silver_line", "kind": "wikipedia", "quote": "A partial solution that did not require a new tunnel opened on October 13, 2009, after fast-track construction using federal stimulus money. The new route, SL4, covers much of the same ground as the proposed Phase III in a dedicated bus lane on the surface that terminates across Atlantic Avenue from South Station, allowing a somewhat circuitous pedestrian transfer between Phase I and Phase II.", "tier": "tertiary", "title": "Silver Line (MBTA) — History — The Silver Line (Liquisearch, mirroring Wikipedia)", "url": "https://www.liquisearch.com/silver_line_mbta/history/the_silver_line" } ] }, { "cityId": "boston", "color": "#7C878E", "displayNumber": "Silver-SL5", "id": "boston-line-Silver-SL5", "name": { "en": "Silver Line SL5" }, "phases": [ { "confidence": "medium", "constructionStart": "2001", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "USD", "isEstimate": false, "value": 27300000, "year": 2002 }, "notes": "Cost of the Washington Street corridor project: $27.3M total, including $10.9M for 17 new CNG buses, $10.9M for road work, and $2.6M for shelters. Environmental documentation filed 1998; construction began 2001. Service launched with 20 stops reduced to 11; a 12th stop at Worcester Square was restored in November 2002. At this date the service was branded simply 'Silver Line' (Washington Street); the SL5 designation was not applied until October 13, 2009. [Citation chase 2026-06-11] The $27.3M total is confirmed by the FTA's 2005 Demonstration Project Evaluation ($27,290,000 capital cost as of July 2005); it excludes $19.23M of road construction reimbursed by the Massachusetts Highway Department. Note the buses+soft-costs actually total ~$13.1M (the $10.9M figure is the bus-purchase line only).", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On July 20, 2002, new Silver Line-branded CNG buses began operation – the first low-floor buses to operate in Boston – and the 20 stops were reduced to 11.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "Environmental documentation was filed in 1998, and construction began in 2001.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The project cost $27.3 million, with major elements including $10.9 million for the 17 new buses, $10.9 million for road work, and $2.6 million for shelters.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "In November 2002, a twelfth stop at Worcester Square was restored.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20251230003330/https://nbrti.org/wp-content/uploads/2017/05/Boston_Silver_Line_final_report.pdf", "kind": "primary", "publisher": "Federal Transit Administration", "quote": "Including vehicle costs, the total capital cost was $27.3 million, or $5.77 million per directional route mile.", "tier": "secondary", "title": "Boston Silver Line Washington Street Bus Rapid Transit (BRT): Demonstration Project Evaluation", "url": "https://nbrti.org/wp-content/uploads/2017/05/Boston_Silver_Line_final_report.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, "geometryRef": null, "id": "boston-silver-sl5-2002", "kind": "initial", "label": { "en": "Washington Street Silver Line service opens: Dudley → Downtown Crossing (later designated SL5)" }, "notes": "[Date chase 2026-06-12] Construction-start year 2001 independently corroborated by the FTA's primary-source Boston Silver Line Washington Street BRT Demonstration Project Evaluation (Sept 2005), which lists 'Start of construction (2001)' in its project development schedule. [Opening-date chase 2026-06-13] NBRTI/FTA primary evaluation report calls July 20, 2002 the 'official launch' (CNG buses deployed, stops reduced 20->11); distinguishes it from prior infrastructure milestones (contraflow lane Dec 2001, construction start 2001). Official launch and start of revenue service are the same date; no separate ceremonial pre-opening.", "opened": "2002-07-20", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On July 20, 2002, new Silver Line-branded CNG buses began operation – the first low-floor buses to operate in Boston – and the 20 stops were reduced to 11.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "Environmental documentation was filed in 1998, and construction began in 2001.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "The project cost $27.3 million, with major elements including $10.9 million for the 17 new buses, $10.9 million for road work, and $2.6 million for shelters.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "In November 2002, a twelfth stop at Worcester Square was restored.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20251230003330/https://nbrti.org/wp-content/uploads/2017/05/Boston_Silver_Line_final_report.pdf", "kind": "primary", "publisher": "Federal Transit Administration", "quote": "The project design drawings were completed in 2001 and construction began that year. [...] Start of construction (2001)", "tier": "primary", "title": "Boston Silver Line Washington Street Bus Rapid Transit (BRT): Demonstration Project Evaluation", "url": "https://nbrti.org/wp-content/uploads/2017/05/Boston_Silver_Line_final_report.pdf", "via": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ], "stationCount": 11 }, { "confidence": "medium", "geometryRef": null, "id": "boston-silver-sl5-2009", "kind": "renumber", "label": { "en": "Washington Street service renamed Route SL5 (concurrent with new SL4 to South Station)" }, "notes": "[Opening-date chase 2026-06-13] This phase is a route renaming (Dudley-Downtown Crossing redesignated SL5), not a new segment opening, effective Oct 13, 2009 concurrent with the SL4 launch. No newly-chased via-attributed sources beyond those already curated.", "opened": "2009-10-13", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251117030911/https://www.mbta.com/news/2009-10-13/patrick-murray-administration-mayor-menino-launch-silver-line-direct-connect", "kind": "primary", "quote": "The existing Silver Line service between Dudley Station and Downtown Crossing with stops at Temple Place and Boylston Street, has been renamed Route SL5.", "tier": "primary", "title": "Patrick-Murray Administration, Mayor Menino Launch Silver Line Direct Connect Service to South Station — MBTA", "url": "https://www.mbta.com/news/2009-10-13/patrick-murray-administration-mayor-menino-launch-silver-line-direct-connect" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20251117030911/https://www.mbta.com/news/2009-10-13/patrick-murray-administration-mayor-menino-launch-silver-line-direct-connect", "kind": "primary", "quote": "Posted on October 13, 2009", "tier": "primary", "title": "Patrick-Murray Administration, Mayor Menino Launch Silver Line Direct Connect Service to South Station — MBTA", "url": "https://www.mbta.com/news/2009-10-13/patrick-murray-administration-mayor-menino-launch-silver-line-direct-connect" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On October 13, 2009, this service was re-designated the SL5; a new SL4 service was added between Dudley and South Station.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200857/https://en.wikipedia.org/wiki/Silver_Line_(MBTA)", "kind": "wikipedia", "quote": "On July 20, 2002, new Silver Line-branded CNG buses began operation – the first low-floor buses to operate in Boston – and the 20 stops were reduced to 11.", "tier": "tertiary", "title": "Silver Line (MBTA) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Silver_Line_(MBTA)" } ] }, { "cityId": "boston", "color": "#DA291C", "displayNumber": "Mattapan", "id": "boston-line-Mattapan", "name": { "en": "Mattapan High Speed Line" }, "phases": [ { "confidence": "medium", "constructionStart": "1929", "geometryRef": "boston-Mattapan", "id": "boston-mattapan-1929", "kind": "initial", "label": { "en": "Stage 1 opens: Ashmont → Milton (high-speed streetcar line, initial section)" }, "notes": "Operated by the Boston Elevated Railway as a 'high-speed' streetcar (PCC-style trolley) line, built because full subway extension beyond Ashmont was deemed too costly. Dorchester Atheneum documents construction starting from Ashmont Terminal on 28 April 1929 and the Ashmont–Milton segment completed 22 August 1929, opening 26 August 1929. [Date chase 2026-06-12] Dorchester Atheneum gives a precise construction-start date of April 28, 1929 (work forces of the Transit Department and the Elevated mobilized building the line from Ashmont Terminal), confirming the 1929 year. [Opening-date chase 2026-06-13] Public revenue opening Aug 26, 1929; Dorchester Atheneum notes it began as a temporary wooden platform at Milton with part-time service (not ceremonial-only).", "opened": "1929-08-26", "segment": { "fromStopIndex": 4, "toStopIndex": 7 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200959/https://en.wikipedia.org/wiki/Mattapan_Line", "kind": "wikipedia", "quote": "The line opened from Ashmont to Milton on August 26, 1929", "tier": "tertiary", "title": "Mattapan Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Mattapan_Line" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20250417212606/https://www.dorchesteratheneum.org/project/mattapan-trolley-high-speed-the-mattapan-ashmont-story/", "kind": "other", "quote": "August 26, 1929: First section opened from Ashmont to Milton Station ... Construction began from Ashmont Terminal April 28, 1929; section from Ashmont to Milton completed August 22, 1929.", "tier": "secondary", "title": "Mattapan Trolley: High-Speed, the Mattapan-Ashmont Story — Dorchester Atheneum", "url": "https://www.dorchesteratheneum.org/project/mattapan-trolley-high-speed-the-mattapan-ashmont-story/" } ] }, { "confidence": "medium", "geometryRef": "boston-Mattapan", "id": "boston-mattapan-1929-2", "kind": "extension", "label": { "en": "Stage 2 opens: Milton → Mattapan (line completed to Mattapan)" }, "notes": "Completed the line to its present Mattapan terminus. [Opening-date chase 2026-06-13] Dec 21, 1929 confirmed as revenue opening of full line: first revenue car departed Mattapan at 5:05 AM (motorman 'Bob' Nelson).", "opened": "1929-12-21", "segment": { "fromStopIndex": 0, "toStopIndex": 4 }, "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200959/https://en.wikipedia.org/wiki/Mattapan_Line", "kind": "wikipedia", "quote": "and from Milton to Mattapan on December 21, 1929", "tier": "tertiary", "title": "Mattapan Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Mattapan_Line" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20250417212606/https://www.dorchesteratheneum.org/project/mattapan-trolley-high-speed-the-mattapan-ashmont-story/", "kind": "other", "quote": "December 21, 1929: Entire line opened to Mattapan. At 5:05 A.M., motorman 'Bob' Nelson left Mattapan with the first revenue car to Ashmont.", "tier": "secondary", "title": "Mattapan Trolley: High-Speed, the Mattapan-Ashmont Story — Dorchester Atheneum", "url": "https://www.dorchesteratheneum.org/project/mattapan-trolley-high-speed-the-mattapan-ashmont-story/" } ] }, { "confidence": "low", "geometryRef": null, "id": "boston-mattapan-1930", "kind": "extension", "label": { "en": "Infill station opens: Capen Street" }, "notes": "Infill station added to the existing line; only month (September 1930) is documented, not an exact day. [Opening-date chase 2026-06-13] Sep 1930 (month precision) for Capen Street infill station rests on a single source chain (Wikipedia citing Belcher PDF, currently inaccessible); Dorchester Atheneum mentions the station but gives no opening date.", "opened": "1930-09", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200959/https://en.wikipedia.org/wiki/Mattapan_Line", "kind": "wikipedia", "quote": "Infill stations were opened at Capen Street in September 1930 and Butler on October 7, 1931.", "tier": "tertiary", "title": "Mattapan Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Mattapan_Line" } ], "stationCount": 1 }, { "confidence": "medium", "geometryRef": null, "id": "boston-mattapan-1931", "kind": "extension", "label": { "en": "Infill station opens: Butler" }, "notes": "Second infill station. [Opening-date chase 2026-06-13] Oct 7, 1931 confirmed by both sources for Butler station platform opening.", "opened": "1931-10-07", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200959/https://en.wikipedia.org/wiki/Mattapan_Line", "kind": "wikipedia", "quote": "Infill stations were opened at Capen Street in September 1930 and Butler on October 7, 1931.", "tier": "tertiary", "title": "Mattapan Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Mattapan_Line" }, { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20250417212606/https://www.dorchesteratheneum.org/project/mattapan-trolley-high-speed-the-mattapan-ashmont-story/", "kind": "other", "quote": "Butler Street Station: The platform was opened on October 7, 1931.", "tier": "secondary", "title": "Mattapan Trolley: High-Speed, the Mattapan-Ashmont Story — Dorchester Atheneum", "url": "https://www.dorchesteratheneum.org/project/mattapan-trolley-high-speed-the-mattapan-ashmont-story/" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": null, "id": "boston-mattapan-1966", "kind": "renumber", "label": { "en": "Red Line designation applied (renumbered from Route 28 Mattapan–Ashmont)" }, "notes": "Branding change under the MBTA: the line, previously known as Route 28 Mattapan–Ashmont, became associated with the Red Line (as a connecting high-speed trolley branch). No physical change. [Opening-date chase 2026-06-13] 1966 is an administrative/branding event (Red Line designation applied), not a revenue-service opening; supported only by a single source chain (Wikipedia citing Belcher PDF, inaccessible).", "opened": "1966", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200959/https://en.wikipedia.org/wiki/Mattapan_Line", "kind": "wikipedia", "quote": "In 1966, the Red Line designation was also applied to the line, which had been known as 28 Mattapan–Ashmont.", "tier": "tertiary", "title": "Mattapan Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Mattapan_Line" } ] }, { "closed": "2006-06-24", "confidence": "medium", "geometryRef": null, "id": "boston-mattapan-2007", "kind": "reopening", "label": { "en": "Line closed for reconstruction (Ashmont station rebuild + accessibility upgrades); reopens" }, "notes": "Line closed with shuttle buses substituting; work included a new elevated loop at Ashmont (part of the larger Ashmont station reconstruction), canopy replacement at Mattapan, rebuilding of intermediate stations, and accessibility upgrades (all stations except Valley Road). No clean line-only construction cost is reliably sourced: search surfaced a ~$6.2M contract attributed specifically to replacing the 1929-built Mattapan station and a separate $7.9M (2017) fleet-overhaul figure, but neither is a documented total for the 2006–07 reconstruction, so cost is omitted rather than guessed. [Opening-date chase 2026-06-13] Reopening (after 2006-2007 reconstruction) confirmed at full-day precision by MBTA's own press release: 'Service resumed Saturday, December 22nd.'", "opened": "2007-12-22", "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200959/https://en.wikipedia.org/wiki/Mattapan_Line", "kind": "wikipedia", "quote": "June 24, 2006, to December 22, 2007, with shuttle buses replacing streetcar service.", "tier": "tertiary", "title": "Mattapan Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Mattapan_Line" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260418201013/https://www.mbta.com/news/2007-12-20/mattapan-trolley-re-opens", "kind": "primary", "publisher": "Massachusetts Bay Transportation Authority (MBTA)", "quote": "Service resumed Saturday, December 22nd", "tier": "primary", "title": "Mattapan Trolley Re-opens — MBTA Press Release", "url": "https://www.mbta.com/news/2007-12-20/mattapan-trolley-re-opens", "via": "https://en.wikipedia.org/wiki/Mattapan_Line" } ] } ], "sources": [ { "accessedAt": "2026-06-10", "archivedUrl": "https://web.archive.org/web/20260418200959/https://en.wikipedia.org/wiki/Mattapan_Line", "kind": "wikipedia", "quote": "Steam trains were discontinued in 1927 and the line was closed for two years while it was modified for streetcars.", "tier": "tertiary", "title": "Mattapan Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Mattapan_Line" } ] } ], "name": { "en": "Boston" } }