{ "bbox": [ 4.72, 52.27, 5.06, 52.42 ], "center": [ 4.9041, 52.3676 ], "country": "Netherlands", "defaultZoom": 10.6, "homeCurrency": "EUR", "id": "amsterdam", "lines": [ { "cityId": "amsterdam", "color": "#FF0000", "displayNumber": "53", "formerNumbers": [ "Oostlijn (east branch)" ], "id": "amsterdam-line-53", "name": { "en": "Gaasperplas Line", "nl": "Gaasperplaslijn" }, "phases": [ { "confidence": "medium", "constructionStart": "1970", "geometryRef": "amsterdam-53", "id": "amsterdam-53-1977", "kind": "initial", "label": { "en": "Oostlijn opens: Weesperplein → Gaasperplas" }, "notes": "Opened as the eastern branch of the (then unnumbered) Oostlijn. The shared 1977 Oostlijn construction cost is recorded once on line 54’s 1977 phase to avoid double-counting. [Date chase 2026-06-12] Construction start dated to 1970 by the ceremonial 'eerste paal' (first pile) driven by Secretary of State Mike Keyzer at Rhijnspoorplein. Three Wikipedia sources agree on 1970, though none carry inline citations; UrbanRail.net's '1960s' framing reflects the 1968 planning decision. [Opening-date chase 2026-06-13] Sources disagree on the exact day: 14 Oct 1977 (NL Metrolijn 53, EN Line 53 body, EN Amsterdam Metro, NL Amsterdamse metro) vs 16 Oct 1977 (NL Oostlijn, UrbanRail.net, EN Line 53 infobox). Year 1977 is unanimous; the well-cited consensus is 14 October.", "opened": "1977-10-14", "segment": { "fromStopIndex": 3, "toStopIndex": 13 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260524171316/https://nl.wikipedia.org/wiki/Metrolijn_53", "kind": "wikipedia", "quote": "Het traject Weesperplein – Gaasperplas werd op 14 oktober 1977 geopend en verving de drukke buslijn 56.", "tier": "secondary", "title": "Metrolijn 53 — Wikipedia (NL)", "url": "https://nl.wikipedia.org/wiki/Metrolijn_53" }, { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260611111106/https://en.wikipedia.org/wiki/Amsterdam_Metro", "kind": "wikipedia", "title": "Amsterdam Metro — Wikipedia (system opened 14 Oct 1977)", "url": "https://en.wikipedia.org/wiki/Amsterdam_Metro" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613160432/https://nl.wikipedia.org/wiki/Oostlijn", "kind": "other", "publisher": "Wikipedia (nl)", "quote": "De bouw startte in 1970.", "tier": "secondary", "title": "Oostlijn — Wikipedia (NL)", "url": "https://nl.wikipedia.org/wiki/Oostlijn", "via": "https://nl.wikipedia.org/wiki/Metrolijn_53" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260524165439/https://nl.wikipedia.org/wiki/Amsterdamse_metro", "kind": "other", "publisher": "Wikipedia (nl)", "quote": "De bouw begon in 1970 toen staatssecretaris Mike Keyzer op het Rhijnspoorplein de eerste paal sloeg.", "tier": "secondary", "title": "Amsterdamse metro — Wikipedia (NL)", "url": "https://nl.wikipedia.org/wiki/Amsterdamse_metro", "via": "https://en.wikipedia.org/wiki/Amsterdam_Metro" } ], "stationCount": 10 }, { "confidence": "medium", "geometryRef": "amsterdam-53", "id": "amsterdam-53-1980", "kind": "extension", "label": { "en": "Extended north to Amsterdam Centraal" }, "opened": "1980-10-11", "segment": { "fromStopIndex": 0, "toStopIndex": 3 }, "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260308014821/https://en.wikipedia.org/wiki/Line_53_(Amsterdam_Metro)", "kind": "wikipedia", "quote": "An extension to Amsterdam Centraal was completed on 11 October 1980.", "tier": "secondary", "title": "Line 53 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_53_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260524003916/https://urbanrail.net/eu/nl/ams/amsterdam.htm", "kind": "other", "publisher": "UrbanRail.net", "quote": "Three years later, on 11 Oct 1980, both lines reached the Centraal Station.", "tier": "tertiary", "title": "UrbanRail.Net > Europe > Netherlands > Amsterdam Metro", "url": "https://www.urbanrail.net/eu/nl/ams/amsterdam.htm", "via": "https://en.wikipedia.org/wiki/Line_53_(Amsterdam_Metro)" } ], "stationCount": 4 } ], "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260308014821/https://en.wikipedia.org/wiki/Line_53_(Amsterdam_Metro)", "kind": "wikipedia", "tier": "secondary", "title": "Line 53 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_53_(Amsterdam_Metro)" } ] }, { "cityId": "amsterdam", "color": "#FCFB05", "displayNumber": "54", "formerNumbers": [ "Oostlijn (south branch)" ], "id": "amsterdam-line-54", "name": { "en": "Gein Line", "nl": "Geinlijn" }, "phases": [ { "confidence": "high", "constructionStart": "1970", "cost": { "basis": "estimate", "confidence": "high", "nominal": { "currency": "NLG", "isEstimate": false, "value": 815000000, "year": 1972 }, "notes": "Construction cost of the ENTIRE 1977 Oostlijn (East Line), shared by lines 53 and 54 — no line-specific figure is published, so it is recorded once here (line 53’s 1977 phase carries no cost to avoid double-counting). Originally budgeted ƒ410M; final cost reported at >ƒ815M (1972 report) — ~ƒ185M budget overrun + ~ƒ225M wage/price inflation. [Citation chase 2026-06-11] The ƒ815M figure is a revised cost projection announced by Alderman Lammers on 21 Dec 1972 during construction (line opened 1977), so it represents a contemporary estimate rather than a verified final out-turn; consider setting isEstimate=true.", "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260611111424/https://www.digibron.nl/viewer/collectie/Digibron/id/tag:RD.nl,19721221:newsml_41f836936a784acd56c88eeaf4df0d1b", "kind": "news", "quote": "De aanleg van de oostlijn van de metro in Amsterdam gaat niet de oorspronkelijk geraamde 410 miljoen, maar ruim 815 miljoen gulden kosten.", "tier": "secondary", "title": "Reformatorisch Dagblad / Digibron — Oostlijn metro Amsterdam kostenoverschrijding (1972)", "url": "https://www.digibron.nl/viewer/collectie/Digibron/id/41f836936a784acd56c88eeaf4df0d1b" }, { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260611111106/https://en.wikipedia.org/wiki/Amsterdam_Metro", "kind": "wikipedia", "quote": "Construction of the Oostlijn (East Line) began in 1970 as the first phase of Amsterdam’s metro system.", "tier": "secondary", "title": "Amsterdam Metro — Wikipedia", "url": "https://en.wikipedia.org/wiki/Amsterdam_Metro" } ] }, "geometryRef": "amsterdam-54", "id": "amsterdam-54-1977", "kind": "initial", "label": { "en": "Oostlijn opens: Weesperplein → Holendrecht" }, "notes": "[Date chase 2026-06-12] Construction start 1970 reflects the Oostlijn (Lines 53+54 built together) as a whole, not Line 54's southern Gein/Holendrecht segment alone. UrbanRail.net gives the broader 'second half of the 1960s' framing. [Opening-date chase 2026-06-13] 14 October 1977 was the festive royal inauguration (Friday) by Princess Beatrix and Prince Claus; nl:Oostlijn and UrbanRail.net give 16 October 1977 as the in-service/revenue start (Sunday). Day-level distinction (ceremonial vs revenue service); year unaffected.", "opened": "1977-10-14", "segment": { "fromStopIndex": 3, "toStopIndex": 12 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20251209114829/https://www.treinreiziger.nl/amsterdamse-metro-bestaat-35-jaar/", "kind": "news", "quote": "Op vrijdag 14 oktober 1977 werd de eerste Amsterdamse metrolijn (de Oostlijn) feestelijk geopend door prinses Beatrix en prins Claus.", "tier": "secondary", "title": "treinreiziger.nl — Amsterdamse metro bestaat 35 jaar", "url": "https://www.treinreiziger.nl/amsterdamse-metro-bestaat-35-jaar/" }, { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260611111106/https://en.wikipedia.org/wiki/Amsterdam_Metro", "kind": "wikipedia", "title": "Amsterdam Metro — Wikipedia", "url": "https://en.wikipedia.org/wiki/Amsterdam_Metro" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613160432/https://nl.wikipedia.org/wiki/Oostlijn", "kind": "other", "publisher": "Wikipedia (Dutch)", "quote": "De bouw startte in 1970.", "tier": "secondary", "title": "Oostlijn — Wikipedia (nl)", "url": "https://nl.wikipedia.org/wiki/Oostlijn", "via": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260524003916/https://urbanrail.net/eu/nl/ams/amsterdam.htm", "kind": "other", "publisher": "UrbanRail.net", "quote": "Construction started in the second half of the 1960s.", "tier": "tertiary", "title": "UrbanRail.Net > Europe > Netherlands > Amsterdam Metro", "url": "https://www.urbanrail.net/eu/nl/ams/amsterdam.htm", "via": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260524171317/https://nl.wikipedia.org/wiki/Metrolijn_54", "kind": "other", "publisher": "Wikipedia (Dutch)", "quote": "Het traject Weesperplein – Holendrecht werd op 14 oktober 1977 geopend en verving de drukke buslijn 55.", "tier": "secondary", "title": "Metrolijn 54 — Wikipedia (nl)", "url": "https://nl.wikipedia.org/wiki/Metrolijn_54", "via": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" } ], "stationCount": 11 }, { "confidence": "medium", "geometryRef": "amsterdam-54", "id": "amsterdam-54-1980", "kind": "extension", "label": { "en": "Extended north to Amsterdam Centraal" }, "notes": "[Opening-date chase 2026-06-13] nl:Oostlijn is a lone outlier giving 12 October 1980 vs the well-supported 11 October 1980; treated as a likely error in that article.", "opened": "1980-10-11", "segment": { "fromStopIndex": 0, "toStopIndex": 3 }, "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260210104258/https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)", "kind": "wikipedia", "quote": "An extension to Amsterdam Centraal was completed on 11 October 1980.", "tier": "tertiary", "title": "Line 54 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260524171317/https://nl.wikipedia.org/wiki/Metrolijn_54", "kind": "other", "publisher": "Wikipedia (Dutch)", "quote": "Op 11 oktober 1980 volgde de verlenging van Weesperplein naar Centraal Station", "tier": "secondary", "title": "Metrolijn 54 — Wikipedia (nl)", "url": "https://nl.wikipedia.org/wiki/Metrolijn_54", "via": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260524003916/https://urbanrail.net/eu/nl/ams/amsterdam.htm", "kind": "other", "publisher": "UrbanRail.net", "quote": "Three years later, on 11 Oct 1980, both lines reached the Centraal Station.", "tier": "tertiary", "title": "UrbanRail.Net > Europe > Netherlands > Amsterdam Metro", "url": "https://www.urbanrail.net/eu/nl/ams/amsterdam.htm", "via": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613160432/https://nl.wikipedia.org/wiki/Oostlijn", "kind": "other", "publisher": "Wikipedia (Dutch)", "quote": "Op 12 oktober 1980 volgde de verlenging naar het Centraal Station.", "tier": "secondary", "title": "Oostlijn — Wikipedia (nl)", "url": "https://nl.wikipedia.org/wiki/Oostlijn", "via": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" } ] }, { "confidence": "medium", "geometryRef": "amsterdam-54", "id": "amsterdam-54-1982", "kind": "extension", "label": { "en": "Extended south: Holendrecht → Gein" }, "opened": "1982-08-27", "segment": { "fromStopIndex": 12, "toStopIndex": 14 }, "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260210104258/https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)", "kind": "wikipedia", "quote": "The final segment, from Holendrecht to Gein, opened on 27 August 1982.", "tier": "tertiary", "title": "Line 54 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260524003916/https://urbanrail.net/eu/nl/ams/amsterdam.htm", "kind": "other", "publisher": "UrbanRail.net", "quote": "The 54 branch was extended to Gein on 27 Aug 1982, after Spaklerweg station had been added on 4 June 1982.", "tier": "tertiary", "title": "UrbanRail.Net > Europe > Netherlands > Amsterdam Metro", "url": "https://www.urbanrail.net/eu/nl/ams/amsterdam.htm", "via": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" } ], "stationCount": 4 } ], "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260210104258/https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)", "kind": "wikipedia", "tier": "secondary", "title": "Line 54 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_54_(Amsterdam_Metro)" } ] }, { "cityId": "amsterdam", "color": "#F69931", "displayNumber": "51", "id": "amsterdam-line-51", "name": { "en": "Amstelveen Line / Ring", "nl": "Amstelveenlijn" }, "phases": [ { "confidence": "high", "constructionStart": "1987", "cost": { "basis": "estimate", "confidence": "low", "nominal": { "currency": "NLG", "isEstimate": true, "value": 130000000, "year": 1990 }, "notes": "Rough estimate — the 1990 Amstelveenlijn sneltram's original build cost is poorly documented. Secondary sources cite ≈ƒ130M (the State contributing ƒ54M); a 1984 planning nota mentioned ~ƒ250M but bundled several lines. Treat as indicative. Pre-construction estimate (ƒ130M expected; ƒ54M national government, remainder City of Amsterdam). [Citation chase 2026-06-11] The cited Wikipedia article \"Planvorming van de Amsterdamse metro\" does not actually contain the ƒ130M / ƒ54M figures (zero refs for the relevant statement), and all attempted corroborating sources (schomakers.net, NVBS/Op de Rails 1988, Delpher/Het Parool) were 404 or inaccessible — so the value is currently untraceable and should be treated as a rough, unverified secondary-source pre-construction estimate.", "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260611111711/https://nl.wikipedia.org/wiki/Planvorming_van_de_Amsterdamse_metro", "kind": "wikipedia", "title": "Planvorming van de Amsterdamse metro — Wikipedia (nl)", "url": "https://nl.wikipedia.org/wiki/Planvorming_van_de_Amsterdamse_metro" } ] }, "geometryRef": "amsterdam-51", "id": "amsterdam-51-1990", "kind": "initial", "label": { "en": "Amstelveenlijn opens (sneltram) to Amstelveen" }, "notes": "[Date chase 2026-06-12] Construction start of August 1987 is corroborated by a contemporaneous De Telegraaf article ('Blokkade tegen sneltram', 21 Aug 1987) cited by EN Wikipedia, and by the official Amstelveenlijn project authority confirming 1987 as the build-decision/start year. The De Telegraaf source via Delpher resolver returned HTTP 403 and could not be read directly; its metadata (title/date/page) is confirmed from the page title. [Opening-date chase 2026-06-13] Three distinct Dec-1990 milestones: 30 Nov 1990 official/ceremonial opening; 1 Dec 1990 free-rides open day (the curated date); 2 Dec 1990 first day of paid revenue service per Dutch Wikipedia. Year unambiguous across all sources.", "opened": "1990-12-01", "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260115235631/https://nl.wikipedia.org/wiki/Metro/sneltramlijn_51", "kind": "wikipedia", "quote": "Official opening: 30 november 1990 ... Regular service commenced 2 december 1990", "tier": "secondary", "title": "Metro/sneltramlijn 51 — Wikipedia (NL)", "url": "https://nl.wikipedia.org/wiki/Metro/sneltramlijn_51" }, { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260206170817/https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)", "kind": "wikipedia", "quote": "The line officially opened on 30 November 1990 ... The line was expected to cost 130 million Dutch guilder, with the government paying 54 million guilder", "tier": "secondary", "title": "Line 51 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613160427/https://www.delpher.nl/nl/kranten/view?coll=ddd&identifier=ddd:011207585:mpeg21:a0149", "kind": "news", "publisher": "De Telegraaf", "quote": "Blokkade tegen sneltram — De Telegraaf, 21 augustus 1987, pagina 6 (article dated 21 August 1987, directly contemporaneous with construction start protests)", "tier": "primary", "title": "Blokkade tegen sneltram (Blockade against express tram)", "url": "https://resolver.kb.nl/resolve?urn=ddd:011207585:mpeg21:a0149", "via": "https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-12", "kind": "primary", "publisher": "Projectorganisatie Amstelveenlijn (operator project body)", "quote": "Het Rijk, Amsterdam en Amstelveen besloten in 1987 de Amstelveenlijn aan te leggen. Lijn 51 ging in december 1990 in gebruik.", "tier": "primary", "title": "Voorgeschiedenis — Amstelveenlijn.nl (archived)", "url": "https://web.archive.org/web/20130902225746/https://www.amstelveenlijn.nl/achtergrond---voorgeschiedenis/achtergrond---voorgeschiedenis", "via": "https://nl.wikipedia.org/wiki/Metro/sneltramlijn_51" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613160432/https://www.delpher.nl/nl/kranten/view?coll=ddd&identifier=ABCDDD:010833313:mpeg21:p001", "kind": "news", "publisher": "Het Parool", "quote": "Sneltram is toch niet snel genoeg (article dated 30 November 1990, cited in Dutch Wikipedia as reference for the official opening on that date)", "tier": "primary", "title": "Sneltram is toch niet snel genoeg — Het Parool, 30 november 1990", "url": "https://resolver.kb.nl/resolve?urn=ABCDDD:010833313:mpeg21:p001", "via": "https://nl.wikipedia.org/wiki/Metro/sneltramlijn_51" } ], "stationCount": 17 }, { "confidence": "low", "geometryRef": null, "id": "amsterdam-51-2004", "kind": "extension", "label": { "en": "Extended to Westwijk" }, "opened": "2004-09-13", "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260206170817/https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)", "kind": "wikipedia", "quote": "The extension of the line to Westwijk was completed in September 2004.", "tier": "secondary", "title": "Line 51 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)" } ] }, { "confidence": "medium", "geometryRef": null, "id": "amsterdam-51-2019", "kind": "renumber", "label": { "en": "Amstelveen branch closed; rerouted west to Isolatorweg" }, "notes": "Reroute onto the existing 1997 Ringlijn western leg (Zuid→Isolatorweg); no new metro construction, so no construction cost is attributed. The former Amstelveen branch closed 2 Mar 2019 and was converted to tram line 25 (out of scope). [Opening-date chase 2026-06-13] EN Wikipedia gives 2 March 2019 as the final day of the old Amstelveen branch; the new west-bound route to Isolatorweg began 3 March 2019 (the curated date).", "opened": "2019-03-03", "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260206170817/https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)", "kind": "wikipedia", "quote": "Metro 51 kept its original route from Amsterdam Centraal to Zuid, and instead of branching off to Amstelveen, it continues west-bound and ends at Isolatorweg", "tier": "secondary", "title": "Line 51 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260216232143/https://www.nhnieuws.nl/nieuws/241367/nog-een-paar-ritjes-en-dan-is-het-over-voor-lijn-51-tussen-amsterdam-en-amstelveen", "kind": "news", "publisher": "NH Nieuws", "quote": "Lijn 51 rijdt vanaf morgen niet meer tussen Amstelveen Westwijk en station Amsterdam Zuid (article dated 2 March 2019, confirming change takes effect 3 March 2019)", "tier": "primary", "title": "Nog een paar ritjes en dan is het over voor lijn 51 tussen Amsterdam en Amstelveen — NH Nieuws", "url": "https://www.nhnieuws.nl/nieuws/241367/nog-een-paar-ritjes-en-dan-is-het-over-voor-lijn-51-tussen-amsterdam-en-amstelveen", "via": "https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)" } ] } ], "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260206170817/https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)", "kind": "wikipedia", "tier": "secondary", "title": "Line 51 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_51_(Amsterdam_Metro)" } ] }, { "cityId": "amsterdam", "color": "#29AB4D", "displayNumber": "50", "id": "amsterdam-line-50", "name": { "en": "Ring Line", "nl": "Ringlijn" }, "phases": [ { "confidence": "medium", "constructionStart": "1992", "cost": { "basis": "estimate", "confidence": "medium", "nominal": { "currency": "NLG", "isEstimate": true, "value": 500000000, "year": 1993 }, "notes": "Estimated total construction cost as reported in 1993 (~ƒ100M already spent by then). The final figure is not firmly sourced (~ƒ400–500M). Line 50 serves 20 stations but only 9 (the Ringlijn arc Zuid→Isolatorweg) were newly built for it; the rest reuse 1977/1982 Oostlijn and 1990 Amstelveenlijn track. ~ƒ500M is a contemporaneous 1993 estimate. [Citation chase 2026-06-11] Contemporary source (Reformatorisch Dagblad, 22 Sept 1993) explicitly states the total construction cost was \"geraamd op circa 500 miljoen gulden\" (estimated at ~ƒ500M) for the full 20.5 km Ringlijn — confirming this is a mid-construction 1993 estimate, not a final outturn, which remains unconfirmed.", "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260611112002/https://www.digibron.nl/viewer/collectie/Digibron/id/tag:RD.nl,19930922:newsml_58351285a640761d5bd2606a0578c136", "kind": "news", "title": "Ringlijn Amsterdam in 1997 in bedrijf — Reformatorisch Dagblad, 22 Sep 1993 (Digibron)", "url": "https://www.digibron.nl/viewer/collectie/Digibron/id/tag:RD.nl,19930922:newsml_58351285a640761d5bd2606a0578c136" } ] }, "geometryRef": "amsterdam-50", "id": "amsterdam-50-1997", "kind": "initial", "label": { "en": "Ringlijn opens: Isolatorweg ↔ Gein" }, "notes": "[Date chase 2026-06-12] Construction-start year 1992 independently corroborated by Geheugen van West (Amsterdam heritage archive, Erik Swierstra, 2004), beyond the two Wikipedia sources. Note: Wikipedia's sole inline reference for the 1992 start is the offline 'Projectleider ringlijn' document with no accessible URL. [Opening-date chase 2026-06-13] Ceremonial opening by Minister Jorritsma on 28 May 1997; revenue/passenger service began 1 June 1997 (curated date). EN Wikipedia infobox uses the 28 May ceremonial date, but prose on both EN and NL Wikipedia, plus the Amsterdam Metro overview article, confirm 1 June 1997 for passenger transport.", "opened": "1997-06-01", "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260611122805/https://nl.wikipedia.org/wiki/Metrolijn_50", "kind": "wikipedia", "quote": "negen nieuwe stations", "tier": "secondary", "title": "Metrolijn 50 — Wikipedia (NL)", "url": "https://nl.wikipedia.org/wiki/Metrolijn_50" }, { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260611122814/https://en.wikipedia.org/wiki/Line_50_(Amsterdam_Metro)", "kind": "wikipedia", "title": "Line 50 (Amsterdam Metro) — Wikipedia (official opening 28 May 1997, service 1 June 1997)", "url": "https://en.wikipedia.org/wiki/Line_50_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260611111106/https://en.wikipedia.org/wiki/Amsterdam_Metro", "kind": "other", "publisher": "Wikipedia (English)", "quote": "Opened on 1 June 1997, the Ringlijn (Ring Line or Circle Line)", "tier": "secondary", "title": "Amsterdam Metro — Wikipedia", "url": "https://en.wikipedia.org/wiki/Amsterdam_Metro", "via": "https://en.wikipedia.org/wiki/Line_50_(Amsterdam_Metro)" } ], "stationCount": 9 } ], "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260611122814/https://en.wikipedia.org/wiki/Line_50_(Amsterdam_Metro)", "kind": "wikipedia", "tier": "secondary", "title": "Line 50 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_50_(Amsterdam_Metro)" } ] }, { "cityId": "amsterdam", "color": "#00ADEF", "displayNumber": "52", "id": "amsterdam-line-52", "name": { "en": "North/South Line", "nl": "Noord/Zuidlijn" }, "phases": [ { "confidence": "high", "constructionStart": "2003-04-22", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "EUR", "isEstimate": false, "value": 3100000000, "year": 2009 }, "notes": "Final cost ≈ €3.1 billion, denominated at 2009 price levels (per cited sources), versus an original estimate of ≈ €1.46 billion. Delays and Vijzelgracht building subsidence (2008) drove major overruns. Planned to open 2011; opened 2018. Final total ≈ €3.1bn (2009 prices); original budget ~€1.46bn (>40% overrun). Opened to public 22 Jul 2018 (official ceremony 21 Jul). [Citation chase 2026-06-11] The €3.1bn final total is corroborated by Railway PRO (2018), but the \"2009 prices\" price-year denomination rests solely on the now-inaccessible Gemeente Amsterdam primary source (wijnemenjemee.nl, dead/redirected; not captured in Wayback) and could not be independently verified; Railway PRO rounds the original estimate to €1.4bn (curated: €1.46bn).", "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20231216205218/https://www.railwaypro.com/wp/amsterdam-completes-eur-3-1-billion-metro-line/", "kind": "news", "title": "Amsterdam completes €3.1 billion metro line — Railway PRO", "url": "https://www.railwaypro.com/wp/amsterdam-completes-eur-3-1-billion-metro-line/" }, { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260611111106/https://en.wikipedia.org/wiki/Amsterdam_Metro", "kind": "wikipedia", "quote": "the total cost estimate has been adjusted to €3.1 billion (at 2009 prices).", "tier": "tertiary", "title": "Amsterdam Metro — Wikipedia", "url": "https://en.wikipedia.org/wiki/Amsterdam_Metro" } ] }, "geometryRef": "amsterdam-52", "id": "amsterdam-52-2018", "kind": "initial", "label": { "en": "Noord/Zuidlijn opens: Noord ↔ Zuid" }, "notes": "[Date chase 2026-06-12] Construction start corrected from 2002 to 22 April 2003; 2002 was the council's definitive approval vote (9 Oct 2002). Year granularity: 2003. Construction-start corrected 2002→2003-04-22 [Date chase 2026-06-12 — panel-confirmed, corrected w/ sign-off] [Opening-date chase 2026-06-13] Ceremonial/official opening 21 July 2018 (mayor's inauguration + public open day, ~60,000 visitors, no fare service); revenue/scheduled service began the next day, 22 July 2018 — the curated date.", "opened": "2018-07-22", "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260308014858/https://en.wikipedia.org/wiki/Line_52_(Amsterdam_Metro)", "kind": "wikipedia", "quote": "The line was officially opened on 21 July 2018 by the mayor of Amsterdam, Femke Halsema and was opened to the public on the next day, 22 July 2018.", "tier": "tertiary", "title": "Line 52 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_52_(Amsterdam_Metro)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260312180044/https://nl.wikipedia.org/wiki/Geschiedenis_van_de_Noord/Zuidlijn", "kind": "other", "publisher": "Wikipedia (Dutch)", "quote": "22 april 2003 || Aanleg Noord/Zuidlijn officieel van start. [...] Met de daadwerkelijke aanleg werd begonnen in april 2003.", "tier": "secondary", "title": "Geschiedenis van de Noord/Zuidlijn — Wikipedia (Dutch)", "url": "https://nl.wikipedia.org/wiki/Geschiedenis_van_de_Noord/Zuidlijn", "via": "https://nl.wikipedia.org/wiki/Metrolijn_52" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20240717221007/https://nos.nl/artikel/2242534-noord-zuidlijn-geopend-er-is-veel-gevraagd-van-amsterdammers.html", "kind": "news", "publisher": "NOS", "quote": "Morgen gaat de dienstregeling in en kunnen reizigers tussen Amsterdam-Noord en station Zuid, dwars door het centrum en onder het IJ, de metrolijn nemen. [Ceremonial opening 21 July; public service starting 22 July]", "tier": "secondary", "title": "Noord/Zuidlijn geopend en er is veel gevraagd van Amsterdammers", "url": "https://nos.nl/artikel/2242534-noord-zuidlijn-geopend-er-is-veel-gevraagd-van-amsterdammers.html", "via": "https://en.wikipedia.org/wiki/Line_52_(Amsterdam_Metro)" } ], "stationCount": 8 } ], "sources": [ { "accessedAt": "2026-06-01", "archivedUrl": "https://web.archive.org/web/20260308014858/https://en.wikipedia.org/wiki/Line_52_(Amsterdam_Metro)", "kind": "wikipedia", "tier": "secondary", "title": "Line 52 (Amsterdam Metro) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Line_52_(Amsterdam_Metro)" } ] } ], "name": { "en": "Amsterdam", "nl": "Amsterdam" } }