{ "bbox": [ 10.5, 59.84, 10.93, 59.99 ], "center": [ 10.74, 59.92 ], "country": "Norway", "defaultZoom": 11, "homeCurrency": "NOK", "id": "oslo", "lines": [ { "cityId": "oslo", "color": "#0073db", "displayNumber": "1", "id": "oslo-line-1", "name": { "en": "Line 1 (Frognerseteren ↔ Bergkrystallen)", "no": "Linje 1 — Holmenkollbanen / Lambertseterbanen" }, "phases": [ { "confidence": "medium", "constructionStart": "1896", "geometryRef": "oslo-1", "id": "oslo-1-holmenkollbanen-1898", "kind": "initial", "label": { "en": "Holmenkollbanen opens: Majorstuen → Holmenkollen (extended to Frognerseteren 1916)" }, "notes": "Opened as a private suburban electric tramway (Holmenkollbanen / forstadsbane), Majorstuen–Besserud, later upgraded to metro standard. No sourced construction cost exists; the prior 600k NOK (1890) figure was unverifiable and premetro, so no cost is recorded. [Date chase 2026-06-12] 1896 corresponds to the founding of the operating company A/S Holmenkolbanen (17 Feb 1896), which was established to build the line; no source directly states a 1896 construction-start year.", "opened": "1898-05-31", "segment": { "fromStopIndex": 16, "toStopIndex": 34 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20251017064357/https://en.wikipedia.org/wiki/Holmenkollen_Line", "kind": "wikipedia", "quote": "The line was opened on 31 May 1898 as a tram line between Majorstuen and Besserud.", "tier": "secondary", "title": "Holmenkollen Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Holmenkollen_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112112128/https://no.wikipedia.org/wiki/Holmenkollbanen", "kind": "wikipedia", "title": "Holmenkollbanen — Wikipedia (no) (Majorstuen–Holmenkollen 1898; Frognerseteren 1916)", "url": "https://no.wikipedia.org/wiki/Holmenkollbanen" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20251112164534/https://en.wikipedia.org/wiki/Holmenkolbanen", "kind": "other", "publisher": "Wikipedia (en)", "quote": "The company was founded on 17 February 1896 by H. M. Heyerdahl and Albert Fenger Krog as the leading executives. The goal was to build a light rail suburban tramway — the Holmenkoll Line — from the Holmenkollen neighborhood in northwestern Oslo to the end of the street tramway at Majorstuen. The line opened first to Besserud (at the time called Holmenkolen) on 31 May 1898.", "tier": "secondary", "title": "A/S Holmenkolbanen — Wikipedia", "url": "https://en.wikipedia.org/wiki/Holmenkolbanen", "via": "https://en.wikipedia.org/wiki/Holmenkollen_Line" } ], "stationCount": 18 }, { "confidence": "medium", "constructionStart": "1912", "cost": { "basis": "outturn", "confidence": "low", "nominal": { "currency": "NOK", "isEstimate": true, "value": 14000000, "year": 1928 }, "notes": "Norway's (and the Nordics') first underground railway, opened by King Haakon VII on 27 Jun 1928. Final construction cost ≈14 million kroner (Oslo city archive) against a 1912 single-track estimate of just 2.3 million; the NOK 11.5M figure in English Wikipedia is a financing/loan figure, not the build cost. Construction began 1912, was halted 1914 by litigation, and resumed 1926. Not independently re-verified in the 2026 research pass; retained from prior curation at low confidence. [Citation chase 2026-06-11] The ≈14M kr figure is the actual outturn (money spent at completion in 1928), not an estimate — the Byarkiv source states \"Da tunnelen sto ferdig var det brukt nesten 14 millioner kroner på den.\" It rests on a single, uncited city-archive blog post (no underlying ledger/council-minutes citation), so confidence remains low.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20240725070218/https://blogg.oslobyarkiv.no/blog/2017/03/15/undergrunnen-mellom-majorstua-og-nationalteateret/", "kind": "primary", "title": "Undergrunnen mellom Majorstua og Nationalteateret — Oslo Byarkiv (≈14M kr)", "url": "https://blogg.oslobyarkiv.no/blog/2017/03/15/undergrunnen-mellom-majorstua-og-nationalteateret/" } ] }, "geometryRef": "oslo-1", "id": "oslo-1-fellestunnelen-vest-1928", "kind": "extension", "label": { "en": "First underground railway: Majorstuen → Nationaltheatret" }, "notes": "[Date chase 2026-06-12] Initial construction (started 1912) halted in October 1914 after about thirty properties were damaged; a settlement was reached in 1925 and construction resumed in 1926, with the western section opening 28 June 1928. [Opening-date chase 2026-06-13] Ceremonial opening by King Haakon VII was 27 June 1928; first day of regular revenue service was 28 June 1928 (Common Tunnel infobox and A/S Holmenkolbanen, both citing Nilsen 1998 p.97).", "opened": "1928-06-27", "segment": { "fromStopIndex": 15, "toStopIndex": 16 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112102036/https://en.wikipedia.org/wiki/Common_Tunnel", "kind": "wikipedia", "title": "Common Tunnel — Wikipedia (western section opened 1928)", "url": "https://en.wikipedia.org/wiki/Common_Tunnel" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20251112164534/https://en.wikipedia.org/wiki/Holmenkolbanen", "kind": "other", "publisher": "Wikipedia (en)", "quote": "Construction started in 1912, but had to stop in October 1914 after about thirty properties had received massive damage from the construction; some even had to be razed. A settlement was not reached until 1925, and construction started again in 1926, with the line opening on 28 June 1928.", "tier": "secondary", "title": "A/S Holmenkolbanen — Wikipedia", "url": "https://en.wikipedia.org/wiki/Holmenkolbanen", "via": "https://en.wikipedia.org/wiki/Common_Tunnel" } ], "stationCount": 1 }, { "confidence": "low", "constructionStart": "1963", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "NOK", "isEstimate": true, "value": 20100000, "year": 1957 }, "notes": "First line of the purpose-built eastern T-bane, opened 22 May 1966. Built first as a metro-standard tramway (Høyenhall–Bergkrystallen, 1957) for ≈20.1M kroner; the 1963–65 metro conversion (new stations) added a further ≈11M kroner excluding third rail. Denomination years are not stated by the sources; figures are nominal at the time. The 20.1M NOK is the 1957 Lambertseter light-rail construction; the 1966 metro-standard upgrade was a separate ~11M NOK (excl. third rail). Cost contested → confirmed by the verification tiebreaker. [Citation chase 2026-06-11] The 20.1M NOK figure is a retrospective actual construction cost (outturn), sourced to a single offline book (Haldsrud, \"Banen og byen\", 2013, p. 52) quoted verbatim on English Wikipedia; no independent online corroboration is available and the linked Sporveien anniversary brochure is a dead link with no Wayback snapshot.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260116101049/https://en.wikipedia.org/wiki/Lambertseter_Line", "kind": "wikipedia", "title": "Lambertseter Line — Wikipedia (20.1M tramway; 11M metro conversion)", "url": "https://en.wikipedia.org/wiki/Lambertseter_Line" } ] }, "geometryRef": "oslo-1", "id": "oslo-1-lambertseterbanen-1966", "kind": "extension", "label": { "en": "Lambertseterbanen — first eastern metro: Brynseng → Bergkrystallen" }, "notes": "[Date chase 2026-06-12] Construction of the new metro stations commenced October 1963 (curated date); broader conversion-to-metro infrastructure work began September 1962 per the same Wikipedia article.", "opened": "1966-05-22", "segment": { "fromStopIndex": 0, "toStopIndex": 8 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260116101049/https://en.wikipedia.org/wiki/Lambertseter_Line", "kind": "wikipedia", "quote": "The last trams operated during the night between 17 and 18 May 1966. ... opened as the first part of the Oslo Metro on 22 May 1966 ... Building the new stations commenced in October 1963 and were completed by the end of 1965, with upgrade costs of 11 million kroner, excluding third rail.", "tier": "secondary", "title": "Lambertseter Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Lambertseter_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251119025449/https://no.wikipedia.org/wiki/Lambertseterbanen", "kind": "wikipedia", "title": "Lambertseterbanen — Wikipedia (no) (opened as T-bane 22 May 1966)", "url": "https://no.wikipedia.org/wiki/Lambertseterbanen" } ], "stationCount": 8 }, { "confidence": "low", "geometryRef": "oslo-1", "id": "oslo-1-fellestunnelen-ost-1966", "kind": "extension", "label": { "en": "Eastern metro tunnel: Brynseng → Grønland → Jernbanetorget" }, "opened": "1966-05-22", "segment": { "fromStopIndex": 8, "toStopIndex": 13 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260116101049/https://en.wikipedia.org/wiki/Lambertseter_Line", "kind": "wikipedia", "quote": "The last trams operated during the night between 17 and 18 May 1966. ... opened as the first part of the Oslo Metro on 22 May 1966 ... Building the new stations commenced in October 1963 and were completed by the end of 1965, with upgrade costs of 11 million kroner, excluding third rail.", "tier": "secondary", "title": "Lambertseter Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Lambertseter_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260512160603/https://no.wikipedia.org/wiki/T-banen_i_Oslo", "kind": "wikipedia", "title": "T-banen i Oslo — Wikipedia (no) (eastern lines reached Jernbanetorget 22 May 1966)", "url": "https://no.wikipedia.org/wiki/T-banen_i_Oslo" } ], "stationCount": 5 }, { "confidence": "low", "constructionStart": "1972", "cost": { "confidence": "low", "nominal": { "currency": "NOK", "isEstimate": true, "value": 158000000, "year": 1986 }, "notes": "The connecting tunnel through the new central station closed the last gap between the 1928 western terminus (Nationaltheatret) and the 1966 eastern terminus (Jernbanetorget), allowing through-running (Sognsvann Line through-routed 4 Apr 1993; full western network by 1995). The original build cost of the station + link is not published anywhere accessible; the only hard figure is the ≈158M-kroner bill to repair water-leakage defects (the city sued contractor Selmer in 1986). Used here as an indicative, clearly non-construction proxy. Not independently re-verified in the 2026 research pass; retained from prior curation at low confidence. [Citation chase 2026-06-11] Chase confirmed the 158M NOK is the 1986 repair bill the city sued Selmer for (water-leakage defects at Sentrum/Stortinget), not a construction cost; the sole supporting Wikipedia ref is an offline NTB wire ('Saksøker Selmer', 25 Sep 1986) with no accessible URL, so the underlying primary remains unverifiable.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112102036/https://en.wikipedia.org/wiki/Common_Tunnel", "kind": "wikipedia", "title": "Common Tunnel — Wikipedia (Sentrum 1977 → Stortinget 1987; NOK 158M repair; through-running 1993)", "url": "https://en.wikipedia.org/wiki/Common_Tunnel" } ] }, "geometryRef": "oslo-1", "id": "oslo-1-stortinget-1987", "kind": "extension", "label": { "en": "Stortinget opens — eastern & western systems finally joined" }, "notes": "[Date chase 2026-06-12] Station opened as Sentrum on 9 January 1977, closed 1983, then reopened as Stortinget on 7 March 1987, completing the east-west connection. The 1972 construction-start statement is sourced to a 1987 Aftenposten article (offline). [Opening-date chase 2026-06-13] Station first opened as Sentrum on 9 January 1977 (eastern lines only), closed February 1983 due to water leaks, and reopened 7 March 1987 as Stortinget joining the eastern and western systems. Curated 1987-03-07 correctly marks the full through-running opening.", "opened": "1987-03-07", "segment": { "fromStopIndex": 13, "toStopIndex": 15 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251229154246/https://en.wikipedia.org/wiki/Stortinget_station", "kind": "wikipedia", "title": "Stortinget station — Wikipedia (opened as Sentrum 1977; reopened as Stortinget 7 Mar 1987)", "url": "https://en.wikipedia.org/wiki/Stortinget_station" } ], "stationCount": 1 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260602065606/https://en.wikipedia.org/wiki/Oslo_Metro", "kind": "wikipedia", "tier": "tertiary", "title": "Oslo Metro — Wikipedia", "url": "https://en.wikipedia.org/wiki/Oslo_Metro" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112164534/https://en.wikipedia.org/wiki/Holmenkolbanen", "kind": "wikipedia", "tier": "tertiary", "title": "Holmenkolbanen — Wikipedia", "url": "https://en.wikipedia.org/wiki/Holmenkolbanen" } ] }, { "cityId": "oslo", "color": "#ec700c", "displayNumber": "2", "id": "oslo-line-2", "name": { "en": "Line 2 (Østerås ↔ Ellingsrudåsen)", "no": "Linje 2 — Røabanen / Furusetbanen" }, "phases": [ { "confidence": "low", "constructionStart": "1911", "geometryRef": "oslo-2", "id": "oslo-2-smestadbanen-1912", "kind": "initial", "label": { "en": "Smestadbanen opens: Majorstuen → Smestad" }, "notes": "[Date chase 2026-06-12] Construction-start year 1911 is implied but not explicitly stated: en.wikipedia Røa Line (citing offline Aspenberg 1995 p.10) gives approval 7 Jul 1911 and completion 7 Nov 1912. No accessible non-Wikipedia source explicitly confirms the 1911 start; DigitaltMuseum primary source returned HTTP 403 and its archived copy lacks a construction-start date. [Opening-date chase 2026-06-13] Norwegian Wikipedia (Røabanen), citing the DigitaltMuseum/Sporveismuseet 'Holmenkollbanen 125 år' primary source, gives the Smestadbanen opening as 17 November 1912 rather than the curated 7 November; year (1912) is unambiguous.", "opened": "1912-11-07", "segment": { "fromStopIndex": 15, "toStopIndex": 17 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251104081318/https://no.wikipedia.org/wiki/R%C3%B8abanen", "kind": "wikipedia", "title": "Røabanen — Wikipedia (no) (Smestadbanen opened 7 Nov 1912)", "url": "https://no.wikipedia.org/wiki/R%C3%B8abanen" } ], "stationCount": 2 }, { "confidence": "low", "geometryRef": "oslo-2", "id": "oslo-2-roabanen-1935", "kind": "extension", "label": { "en": "Røabanen extension: Smestad → Røa" }, "opened": "1935-01-24", "segment": { "fromStopIndex": 17, "toStopIndex": 21 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251104081318/https://no.wikipedia.org/wiki/R%C3%B8abanen", "kind": "wikipedia", "title": "Røabanen — Wikipedia (no) (Røa extension opened 24 Jan 1935)", "url": "https://no.wikipedia.org/wiki/R%C3%B8abanen" } ], "stationCount": 4 }, { "confidence": "low", "geometryRef": "oslo-2", "id": "oslo-2-roabanen-1951", "kind": "extension", "label": { "en": "Røabanen extension: Røa → Lijordet (Grini 1948, Eiksmarka/Lijordet 1951)" }, "opened": "1951-12-03", "segment": { "fromStopIndex": 21, "toStopIndex": 24 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251104081318/https://no.wikipedia.org/wiki/R%C3%B8abanen", "kind": "wikipedia", "title": "Røabanen — Wikipedia (no) (Grini 1948; Eiksmarka/Lijordet 3 Dec 1951)", "url": "https://no.wikipedia.org/wiki/R%C3%B8abanen" } ], "stationCount": 3 }, { "confidence": "low", "geometryRef": "oslo-2", "id": "oslo-2-furusetbanen-1970", "kind": "extension", "label": { "en": "Furusetbanen opens: Hellerud → Haugerud" }, "opened": "1970-11-18", "segment": { "fromStopIndex": 4, "toStopIndex": 7 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260115154545/https://en.wikipedia.org/wiki/Furuset_Line", "kind": "wikipedia", "quote": "The first part of the line, from Hellerud to Haugerud, was opened on 18 November 1970", "tier": "secondary", "title": "Furuset Line — Wikipedia (Hellerud–Haugerud opened 18 Nov 1970)", "url": "https://en.wikipedia.org/wiki/Furuset_Line" } ], "stationCount": 2 }, { "confidence": "low", "geometryRef": "oslo-2", "id": "oslo-2-osterasbanen-1972", "kind": "extension", "label": { "en": "Østeråsbanen extension: Lijordet → Østerås" }, "notes": "[Opening-date chase 2026-06-13] Norwegian Wikipedia gives the Østerås extension as 16 November 1972 vs the curated 15 November; year (1972) is unambiguous.", "opened": "1972-11-15", "segment": { "fromStopIndex": 24, "toStopIndex": 25 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251104081318/https://no.wikipedia.org/wiki/R%C3%B8abanen", "kind": "wikipedia", "title": "Røabanen — Wikipedia (no) (Østerås extension opened Nov 1972)", "url": "https://no.wikipedia.org/wiki/R%C3%B8abanen" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "oslo-2", "id": "oslo-2-furusetbanen-1974", "kind": "extension", "label": { "en": "Furusetbanen extension: Haugerud → Trosterud" }, "opened": "1974-12-15", "segment": { "fromStopIndex": 3, "toStopIndex": 4 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260115154545/https://en.wikipedia.org/wiki/Furuset_Line", "kind": "wikipedia", "quote": "The line was further extended to Trosterud on 15 December 1974", "tier": "secondary", "title": "Furuset Line — Wikipedia (Haugerud–Trosterud opened 15 Dec 1974)", "url": "https://en.wikipedia.org/wiki/Furuset_Line" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "oslo-2", "id": "oslo-2-furusetbanen-1978", "kind": "extension", "label": { "en": "Furusetbanen extension: Trosterud → Furuset" }, "opened": "1978-02-19", "segment": { "fromStopIndex": 1, "toStopIndex": 3 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260115154545/https://en.wikipedia.org/wiki/Furuset_Line", "kind": "wikipedia", "quote": "to Furuset on 19 February 1978", "tier": "secondary", "title": "Furuset Line — Wikipedia (Trosterud–Furuset opened 19 Feb 1978)", "url": "https://en.wikipedia.org/wiki/Furuset_Line" } ], "stationCount": 2 }, { "confidence": "low", "cost": { "basis": "outturn", "confidence": "low", "nominal": { "currency": "NOK", "isEstimate": true, "value": 48000000, "year": 1981 }, "notes": "The Furuset → Ellingsrudåsen extension (Ellingsrudåsen is an underground rock-cavern terminus) cost ≈50M kroner at the time; English Wikipedia separately states the whole Furuset Line 'ended at 48 million NOK'. The two figures come from different cited contexts and cannot be reconciled — both are rough nominal values, denomination year unstated. Corrected to NOK 48M per sourced figure (\"the cost…ended at 48 million\"); contested → confirmed by the tiebreaker. [Citation chase 2026-06-11] Source quotes (\"the cost...ended at 48 million\"; \"the line extension cost 50 million...at the time\") indicate an actual final (outturn) cost in nominal 1981 NOK, not an estimate; isEstimate should likely be false. The 48M figure derives from the Furuset Line Wikipedia article (citing Haldsrud 2013, p.148), which should be attached as a source; both 48M and 50M figures trace to offline print sources that cannot be independently verified.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251226125441/https://en.wikipedia.org/wiki/Ellingsrud%C3%A5sen_station", "kind": "wikipedia", "title": "Ellingsrudåsen station — Wikipedia (opened 8 Nov 1981; ≈50M NOK extension)", "url": "https://en.wikipedia.org/wiki/Ellingsrud%C3%A5sen_station" } ] }, "geometryRef": "oslo-2", "id": "oslo-2-ellingsrudasen-1981", "kind": "extension", "label": { "en": "Furusetbanen extension: Furuset → Ellingsrudåsen" }, "opened": "1981-11-08", "segment": { "fromStopIndex": 0, "toStopIndex": 1 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260115154545/https://en.wikipedia.org/wiki/Furuset_Line", "kind": "wikipedia", "quote": "and finally to Ellingsrudåsen on 8 November 1981", "tier": "secondary", "title": "Furuset Line — Wikipedia (Furuset–Ellingsrudåsen opened 8 Nov 1981)", "url": "https://en.wikipedia.org/wiki/Furuset_Line" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "oslo-2", "id": "oslo-2-1966-shared-7", "kind": "extension", "label": { "en": "Shared central section (track opened with line 1)" }, "notes": "Runs over the common central tunnel that opened with line 1 on 1966-05-22; attributed here for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1966-05-22", "segment": { "fromStopIndex": 7, "toStopIndex": 12 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260116101049/https://en.wikipedia.org/wiki/Lambertseter_Line", "kind": "wikipedia", "quote": "The last trams operated during the night between 17 and 18 May 1966. ... opened as the first part of the Oslo Metro on 22 May 1966 ... Building the new stations commenced in October 1963 and were completed by the end of 1965, with upgrade costs of 11 million kroner, excluding third rail.", "tier": "secondary", "title": "Lambertseter Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Lambertseter_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251119025449/https://no.wikipedia.org/wiki/Lambertseterbanen", "kind": "wikipedia", "title": "Lambertseterbanen — Wikipedia (no) (opened as T-bane 22 May 1966)", "url": "https://no.wikipedia.org/wiki/Lambertseterbanen" } ] }, { "confidence": "low", "geometryRef": "oslo-2", "id": "oslo-2-1987-shared-13", "kind": "extension", "label": { "en": "Shared central section (track opened with line 1)" }, "notes": "Runs over the common central tunnel that opened with line 1 on 1987-03-07; attributed here for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1987-03-07", "segment": { "fromStopIndex": 12, "toStopIndex": 15 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251229154246/https://en.wikipedia.org/wiki/Stortinget_station", "kind": "wikipedia", "title": "Stortinget station — Wikipedia (opened as Sentrum 1977; reopened as Stortinget 7 Mar 1987)", "url": "https://en.wikipedia.org/wiki/Stortinget_station" } ] }, { "confidence": "low", "geometryRef": "oslo-2", "id": "oslo-2-1928-shared-14", "kind": "extension", "label": { "en": "Shared central section (track opened with line 1)" }, "notes": "Runs over the common central tunnel that opened with line 1 on 1928-06-27; attributed here for map continuity (no separate cost, to avoid double-counting shared infrastructure). [Opening-date chase 2026-06-13] Day-level conflict for the 1928 western tunnel opening: body text (Nilsen 1998) gives 27 June, while two infoboxes give 28 June; year and month are not in dispute.", "opened": "1928-06-27", "segment": { "fromStopIndex": 14, "toStopIndex": 14 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112102036/https://en.wikipedia.org/wiki/Common_Tunnel", "kind": "wikipedia", "title": "Common Tunnel — Wikipedia (western section opened 1928)", "url": "https://en.wikipedia.org/wiki/Common_Tunnel" } ] } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611125149/https://en.wikipedia.org/wiki/Roabanen", "kind": "wikipedia", "tier": "tertiary", "title": "Røa Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Roabanen" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260115154545/https://en.wikipedia.org/wiki/Furuset_Line", "kind": "wikipedia", "tier": "tertiary", "title": "Furuset Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Furuset_Line" } ] }, { "cityId": "oslo", "color": "#a85fa5", "displayNumber": "3", "id": "oslo-line-3", "name": { "en": "Line 3 (Kolsås ↔ Mortensrud)", "no": "Linje 3 — Kolsåsbanen / Østensjøbanen" }, "phases": [ { "confidence": "low", "geometryRef": "oslo-3", "id": "oslo-3-kolsasbanen-1924", "kind": "initial", "label": { "en": "Kolsåsbanen opens: Majorstuen → Bekkestua" }, "opened": "1924-07-01", "segment": { "fromStopIndex": 17, "toStopIndex": 25 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260104004149/https://en.wikipedia.org/wiki/Kols%C3%A5s_Line", "kind": "wikipedia", "quote": "The line to Bekkestua opened on 1 July 1924 and the extension to Haslum on 4 November.", "tier": "secondary", "title": "Kolsås Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Kols%C3%A5s_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251115003929/https://no.wikipedia.org/wiki/Kols%C3%A5sbanen", "kind": "wikipedia", "title": "Kolsåsbanen — Wikipedia (no) (opened to Bekkestua 1 Jul 1924)", "url": "https://no.wikipedia.org/wiki/Kols%C3%A5sbanen" } ], "stationCount": 8 }, { "confidence": "low", "geometryRef": "oslo-3", "id": "oslo-3-kolsasbanen-1930", "kind": "extension", "label": { "en": "Kolsåsbanen extension: Bekkestua → Kolsås" }, "opened": "1930-01-01", "segment": { "fromStopIndex": 25, "toStopIndex": 32 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260104004149/https://en.wikipedia.org/wiki/Kols%C3%A5s_Line", "kind": "wikipedia", "quote": "The 4.3-kilometer (2.7 mi) extension opened on 1 January 1930.", "tier": "secondary", "title": "Kolsås Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Kols%C3%A5s_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251115003929/https://no.wikipedia.org/wiki/Kols%C3%A5sbanen", "kind": "wikipedia", "title": "Kolsåsbanen — Wikipedia (no) (extended to Kolsås 1930)", "url": "https://no.wikipedia.org/wiki/Kols%C3%A5sbanen" } ], "stationCount": 7 }, { "confidence": "low", "constructionStart": "1965", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "NOK", "isEstimate": true, "value": 39000000, "year": 1967 }, "notes": "Originally a 1923–26 suburban tramway, converted to full T-bane standard and opened (as the third eastern metro line) on 26 Nov 1967. English Wikipedia gives the Helsfyr–Skullerud upgrade as ≈39M kroner; denomination year not stated. Total Helsfyr–Skullerud (Østensjøbanen) cost; contested → confirmed by the tiebreaker. [Citation chase 2026-06-11] Source wording (\"the total costs ... ended at 39 million\") indicates an actual final (outturn) cost rather than an estimate; the figure ultimately rests on a single offline Norwegian-language book citation (Haldsrud, Banen og byen, 2013, p.118) that could not be independently verified online.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260108170315/https://en.wikipedia.org/wiki/%C3%98stensj%C3%B8_Line", "kind": "wikipedia", "title": "Østensjø Line — Wikipedia (Helsfyr–Skullerud ≈39M NOK; metro 1967)", "url": "https://en.wikipedia.org/wiki/%C3%98stensj%C3%B8_Line" } ] }, "geometryRef": "oslo-3", "id": "oslo-3-ostensjobanen-1967", "kind": "extension", "label": { "en": "Østensjøbanen converted to metro: Hellerud → Skullerud" }, "notes": "[Date chase 2026-06-12] Construction-start of 1965 remains unsourced; bracketed by the 31 Jan 1964 section approval and 26 Nov 1967 opening, which are consistent with but do not pin down 1965.", "opened": "1967-11-26", "segment": { "fromStopIndex": 1, "toStopIndex": 9 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260108170315/https://en.wikipedia.org/wiki/%C3%98stensj%C3%B8_Line", "kind": "wikipedia", "quote": "The extension from Bøler to Skullerud opened on 26 November 1967.", "tier": "secondary", "title": "Østensjø Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/%C3%98stensj%C3%B8_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611125428/https://en.wikipedia.org/wiki/Skullerud_(station)", "kind": "wikipedia", "title": "Skullerud (station) — Wikipedia (opened 26 Nov 1967)", "url": "https://en.wikipedia.org/wiki/Skullerud_(station)" } ], "stationCount": 7 }, { "confidence": "low", "constructionStart": "1995", "cost": { "basis": "budget", "confidence": "high", "nominal": { "currency": "NOK", "isEstimate": true, "value": 250000000, "year": 1998 }, "notes": "Mortensrud extension (taken into use 24 Nov 1997, officially opened 4 Jan 1998): ≈215M kroner for the extension plus ≈35M for Mortensrud station, per the station's Wikipedia article. Summed here to ≈250M; denomination year not stated. Mortensrud extension ≈ NOK 250M (NOK 215M excl. the station). [Citation chase 2026-06-11] Both figures are denominated in 1996 kroner per the Oslo Package 2 primary fact sheets (215M for the Skullerud→Mortensrud extension, id=44; 35M for the Mortensrud terminal/station, id=45) — so the denomination year is 1996, not 1998 (the opening year). The figures are Oslopakke 2 project-database costs (execution 1995–1997/1998), i.e. an authorized/budget basis rather than a settled final outturn.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251222012904/https://en.wikipedia.org/wiki/Mortensrud_station", "kind": "wikipedia", "title": "Mortensrud station — Wikipedia (215M extension + 35M station; opened 1998)", "url": "https://en.wikipedia.org/wiki/Mortensrud_station" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Statens vegvesen Oslo / Oslo Package 2 (Oslopakke 2)", "quote": "KOSTNAD: 215 mill kr (1996-kr)", "tier": "primary", "title": "Mortensrud - T-baneforlengelse (Oslo Package 2 fact sheet)", "url": "https://web.archive.org/web/20110725164944/http://www.avinet.no/Oslopakke2/database/faktaark_ny.aspx?id=44", "via": "https://en.wikipedia.org/wiki/Mortensrud_station" }, { "accessedAt": "2026-06-11", "kind": "primary", "publisher": "Statens vegvesen Oslo / Oslo Package 2 (Oslopakke 2)", "quote": "KOSTNAD: 35 mill kr (1996-kr)", "tier": "primary", "title": "Mortensrud - ny terminal (Oslo Package 2 fact sheet)", "url": "https://web.archive.org/web/20110725164954/http://www.avinet.no/Oslopakke2/database/faktaark_ny.aspx?id=45", "via": "https://en.wikipedia.org/wiki/Mortensrud_station" } ] }, "geometryRef": "oslo-3", "id": "oslo-3-mortensrud-1998", "kind": "extension", "label": { "en": "Østensjøbanen extension: Skullerud → Mortensrud" }, "notes": "[Date chase 2026-06-12] Construction was originally planned to start in 1992 (completion 1994) but did not begin until 1995, confirming the curated year. Opening date corrected 1998-01-04→1997-11-24 (revenue service vs ceremonial/structure) [Opening-date chase 2026-06-13 — panel-confirmed, corrected w/ sign-off] [Opening-date chase 2026-06-13] Station taken into revenue service 24 Nov 1997; officially opened (with bus terminal) 4 Jan 1998. Revenue-service date precedes the ceremonial opening by six weeks and falls in the prior year.", "opened": "1997-11-24", "segment": { "fromStopIndex": 0, "toStopIndex": 1 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251222012904/https://en.wikipedia.org/wiki/Mortensrud_station", "kind": "wikipedia", "title": "Mortensrud station — Wikipedia (in use 24 Nov 1997, official 4 Jan 1998)", "url": "https://en.wikipedia.org/wiki/Mortensrud_station" } ], "stationCount": 1 }, { "confidence": "high", "constructionStart": "2006", "cost": { "basis": "estimate", "confidence": "high", "nominal": { "currency": "NOK", "isEstimate": true, "value": 2900000000, "year": 2012 }, "notes": "After years of decay the Kolsås Line was closed from 1 Jul 2006 and completely rebuilt to metro standard with 13 new stations, reopening in stages and reaching Kolsås on 12 Oct 2014. Total ≈2.9 billion 2012-kroner (Sporveien / NRK), split into program phases of ≈553M (Oslo section), ≈1,180M and ≈1,255M kroner. This phase carries the cost only — its geometry (the original 1924/1930 alignment) is already drawn by the two phases above, so it is not redrawn. Figure is a 2012 total-cost ESTIMATE for the Kolsåsbanen metro-standard rebuild, not a final accounted cost. [Citation chase 2026-06-11] The 2.9bn figure was the 2012 cost framework; Sporveien confirmed at the 12 Oct 2014 reopening that the project was delivered \"within the cost framework of 2.9 billion kroner\" (~kr 230,000 per linear metre over the 12.1 km Sørbyhaugen–Kolsås stretch), so the 2012 estimate closely matched the outturn.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611125454/https://www.mynewsdesk.com/no/sporveien/pressreleases/kolsaasbanen-er-ferdigstilt-og-aapnet-for-trafikk-helt-til-kolsaas-1066989", "kind": "news", "title": "Kolsåsbanen ferdigstilt og åpnet helt til Kolsås — Sporveien (2.9bn kr, 13 stations, 12 Oct 2014)", "url": "https://www.mynewsdesk.com/no/sporveien/pressreleases/kolsaasbanen-er-ferdigstilt-og-aapnet-for-trafikk-helt-til-kolsaas-1066989" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251115003929/https://no.wikipedia.org/wiki/Kols%C3%A5sbanen", "kind": "wikipedia", "title": "Kolsåsbanen — Wikipedia (no) (2,9 milliarder 2012-kroner)", "url": "https://no.wikipedia.org/wiki/Kols%C3%A5sbanen" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20260613164139/https://www.sporveien.no/-innstillinger-/404/", "kind": "primary", "publisher": "Sporveien / Oslo T-banedrift AS", "quote": "Det har kostet 2,9 Mrd kroner, ca kr 230 000 pr.lengdemeter å modernisere Kolsåsbanen til dagens Metrostandard.", "tier": "primary", "title": "Kolsåsbanen gjenåpnes for ordinær drift søndag 12.oktober — Sporveien Oslo AS / tbanen.no (archived 25 Dec 2014)", "url": "https://web.archive.org/web/20141225153018/http://www.tbanen.no/ikbViewer/page/inter/omtbanen/artikkel?p_document_id=2497298", "via": "https://no.wikipedia.org/wiki/Kols%C3%A5sbanen" } ] }, "geometryRef": null, "id": "oslo-3-kolsasbanen-rebuild-2014", "kind": "reopening", "label": { "en": "Kolsåsbanen rebuilt to metro standard (Sørbyhaugen → Kolsås)" }, "notes": "[Date chase 2026-06-12] 2006 reflects the 1 July 2006 line closure that began the upgrade programme; per the no.wiki phased table, physical construction on individual Oslo/Baerum segments began September 2008.", "opened": "2014-10-12", "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260104004149/https://en.wikipedia.org/wiki/Kols%C3%A5s_Line", "kind": "wikipedia", "quote": "The final stage was officially reopened on 12 October 2014.", "tier": "secondary", "title": "Kolsås Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Kols%C3%A5s_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611125424/https://www.nrk.no/stor-oslo/kolsasbanen-apnes-igjen-1.11980875", "kind": "news", "title": "Kolsåsbanen åpnes igjen — NRK Stor-Oslo (reopened to Kolsås 12 Oct 2014)", "url": "https://www.nrk.no/stor-oslo/kolsasbanen-apnes-igjen-1.11980875" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613164029/https://no.wikipedia.org/wiki/Kols%C3%A5sbanen", "kind": "other", "publisher": "Wikipedia (Norwegian)", "quote": "Banen ble da stengt helt fra Husebybakken stasjon som ligger mellom Smestad og Montebello...1. juli 2006. I Oslo startet det videre arbeidet for strekningen fram til nye Bjørnsletta stasjon og videre til bygrensen i september 2008.", "tier": "tertiary", "title": "Kolsåsbanen — Wikipedia (no)", "url": "https://no.wikipedia.org/wiki/Kolsåsbanen", "via": "https://en.wikipedia.org/wiki/Kols%C3%A5s_Line" } ], "stationCount": 13 }, { "confidence": "low", "geometryRef": "oslo-3", "id": "oslo-3-1966-shared-9", "kind": "extension", "label": { "en": "Shared central section (track opened with line 1)" }, "notes": "Runs over the common central tunnel that opened with line 1 on 1966-05-22; attributed here for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1966-05-22", "segment": { "fromStopIndex": 9, "toStopIndex": 14 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260116101049/https://en.wikipedia.org/wiki/Lambertseter_Line", "kind": "wikipedia", "quote": "The last trams operated during the night between 17 and 18 May 1966. ... opened as the first part of the Oslo Metro on 22 May 1966 ... Building the new stations commenced in October 1963 and were completed by the end of 1965, with upgrade costs of 11 million kroner, excluding third rail.", "tier": "secondary", "title": "Lambertseter Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Lambertseter_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251119025449/https://no.wikipedia.org/wiki/Lambertseterbanen", "kind": "wikipedia", "title": "Lambertseterbanen — Wikipedia (no) (opened as T-bane 22 May 1966)", "url": "https://no.wikipedia.org/wiki/Lambertseterbanen" } ] }, { "confidence": "low", "geometryRef": "oslo-3", "id": "oslo-3-1987-shared-15", "kind": "extension", "label": { "en": "Shared central section (track opened with line 1)" }, "notes": "Runs over the common central tunnel that opened with line 1 on 1987-03-07; attributed here for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1987-03-07", "segment": { "fromStopIndex": 14, "toStopIndex": 17 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251229154246/https://en.wikipedia.org/wiki/Stortinget_station", "kind": "wikipedia", "title": "Stortinget station — Wikipedia (opened as Sentrum 1977; reopened as Stortinget 7 Mar 1987)", "url": "https://en.wikipedia.org/wiki/Stortinget_station" } ] }, { "confidence": "low", "geometryRef": "oslo-3", "id": "oslo-3-1928-shared-16", "kind": "extension", "label": { "en": "Shared central section (track opened with line 1)" }, "notes": "Runs over the common central tunnel that opened with line 1 on 1928-06-27; attributed here for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1928-06-27", "segment": { "fromStopIndex": 16, "toStopIndex": 16 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112102036/https://en.wikipedia.org/wiki/Common_Tunnel", "kind": "wikipedia", "title": "Common Tunnel — Wikipedia (western section opened 1928)", "url": "https://en.wikipedia.org/wiki/Common_Tunnel" } ] } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260104004149/https://en.wikipedia.org/wiki/Kols%C3%A5s_Line", "kind": "wikipedia", "tier": "tertiary", "title": "Kolsås Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Kols%C3%A5s_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260108170315/https://en.wikipedia.org/wiki/%C3%98stensj%C3%B8_Line", "kind": "wikipedia", "tier": "tertiary", "title": "Østensjø Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/%C3%98stensj%C3%B8_Line" } ] }, { "cityId": "oslo", "color": "#004a98", "displayNumber": "4", "id": "oslo-line-4", "name": { "en": "Line 4 (Bergkrystallen ↔ Vestli, via Ring & Løren)", "no": "Linje 4 — Sognsvannsbanen / Ringen / Lørenbanen" }, "phases": [ { "confidence": "low", "constructionStart": "1932", "geometryRef": "oslo-4", "id": "oslo-4-sognsvannsbanen-1934", "kind": "initial", "label": { "en": "Sognsvannsbanen (inner): Majorstuen → Ullevål stadion" }, "notes": "[Date chase 2026-06-12] Construction-start year is split between sources: Norwegian tertiary sources (Lokalhistoriewiki, Skinnelangs) and no.wp support 1932 (labor dispute resolved 15 Dec 1932), while en.wp citing Aspenberg 1995 (p.17, offline) says work recommenced in 1933. Original works ran Jan 1922 to the 1924 dispute, then resumed 1932/1933; line opened 10 Oct 1934. [Opening-date chase 2026-06-13] A municipal inspection tour (kommunal befaring) was held 22 September 1934; this was not a public revenue-service opening. Public opening was 10 October 1934. The whole line (Majorstuen-Sognsvann) opened at once, not in sub-segments.", "opened": "1934-10-10", "segment": { "fromStopIndex": 16, "toStopIndex": 19 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20251010075759/https://en.wikipedia.org/wiki/Sognsvannsbanen", "kind": "wikipedia", "quote": "Work commenced again in 1933 and the line opened on 10 October 1934.", "tier": "secondary", "title": "Sognsvann Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Sognsvannsbanen" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260218144418/https://no.wikipedia.org/wiki/Sognsvannsbanen", "kind": "wikipedia", "title": "Sognsvannsbanen — Wikipedia (no) (opened 10 Oct 1934)", "url": "https://no.wikipedia.org/wiki/Sognsvannsbanen" } ], "stationCount": 3 }, { "confidence": "high", "constructionStart": "2000", "cost": { "basis": "outturn", "confidence": "high", "nominal": { "currency": "NOK", "isEstimate": false, "value": 590000000, "year": 2003 }, "notes": "Stage 1 of the Ring (Ullevål stadion–Nydalen–Storo), opened 20 Aug 2003, cost ≈590M kroner. The whole ring (to Carl Berners plass, 2006) totalled ≈1,348M kroner, financed largely through Oslo Package 2. Cost of the Ring Line first section. [Citation chase 2026-06-11] Per the Oslo Package 2 fact sheet (id=46), the 590M stage-1 figure is stated in fixed 2000-kroner (Ullevål–Storo), while the full-ring 1,348M total is in 2004-kroner; the price-year base for the 590M value should be 2000, not 2003.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260205042453/https://en.wikipedia.org/wiki/Ring_Line_(Oslo)", "kind": "wikipedia", "title": "Ring Line (Oslo) — Wikipedia (stage 1 ≈590M kr; total ≈1,348M kr)", "url": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20210308215418/https://web.archive.org/web/20110501173155/http://www.avinet.no/Oslopakke2/database/faktaark_ny.aspx?id=46", "kind": "primary", "publisher": "Oslo Package 2 / Samferdselsetaten Oslo kommune", "quote": "KOSTNAD: 1,348 mill kr (2004-kr) - Ullevål - Storo: 590 mill (2000-kr)", "tier": "secondary", "title": "T-baneringen — Gjennomførte kollektivtiltak i Oslo og Akershus 1990–2006 (Oslo Package 2 fact sheet, id=46)", "url": "https://web.archive.org/web/20110501173155/http://www.avinet.no/Oslopakke2/database/faktaark_ny.aspx?id=46", "via": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" } ] }, "geometryRef": "oslo-4", "id": "oslo-4-ringen-2003", "kind": "extension", "label": { "en": "Ring Line stage 1: Ullevål stadion → Storo (via Nydalen)" }, "notes": "[Date chase 2026-06-12] Store norske leksikon and both-language Wikipedias narrow the construction start to June 2000 for stage 1 (Ullevaal stadion to Storo via Nydalen); curated year 2000 confirmed.", "opened": "2003-08-20", "segment": { "fromStopIndex": 19, "toStopIndex": 21 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260205042453/https://en.wikipedia.org/wiki/Ring_Line_(Oslo)", "kind": "wikipedia", "quote": "The first section opened from Ullevål stadion via Nydalen to Storo on 20 August 2003 ... costing NOK 590 million", "tier": "secondary", "title": "Ring Line (Oslo) — Wikipedia (stage 1 opened 20 Aug 2003)", "url": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20140227070324/http://www.aftenposten.no/nyheter/iriks/article1428274.ece", "kind": "news", "publisher": "Aftenposten Aften", "quote": "[Cited in en.wp as the ref for 'Construction started in June'; print article, page 12, 14 March 2000 — dead link online]", "tier": "secondary", "title": "Oslo kommune og staten er blitt enige T-baneringen på vei — Aftenposten Aften, 14 March 2000 (Einar Haakaas, p.12)", "url": "https://www.aftenposten.no/nyheter/iriks/article1428274.ece", "via": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" }, { "accessedAt": "2026-06-13", "kind": "primary", "publisher": "Ruter AS (Oslo/Akershus transit authority)", "quote": "Første etappe av T-baneringen åpnes til Nydalen og Storo 20. august.", "tier": "primary", "title": "Tidslinje — Ruter (archived 2009)", "url": "https://web.archive.org/web/20090220144410/http://ruter.no/Miljo-og-kultur/Tidslinje/", "via": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" } ], "stationCount": 2 }, { "confidence": "medium", "cost": { "basis": "outturn", "confidence": "medium", "nominal": { "currency": "NOK", "isEstimate": true, "value": 758000000, "year": 2006 }, "notes": "Stage 2 (Storo–Sinsen–Carl Berners plass) completed the ring on 20 Aug 2006. No isolated stage-2 figure is published; this ≈758M kroner is the difference between the published whole-ring total (≈1,348M) and the ≈590M stage-1 cost. Treat as a derived estimate. (This phase draws the Storo→Sinsen arc; the short Sinsen→Carl Berners closing link is carried on the Grorud spine.) Second Ring Line section; 590M (2003) + 758M (2006) ≈ NOK 1.348B for the whole Ring Line project, matching the combined figure reported. [Citation chase 2026-06-11] No source publishes an isolated stage-2 cost; the 758M figure is derived by subtraction and the two components are in different price-year bases (whole-ring total 1,348M in 2004-kr, stage-1 590M in 2000-kr), so it is an approximation rather than a true nominal cost. The whole-ring total is independently confirmed by the Oslo Package 2 factsheet (1,348M) and Aftenposten's August 2006 completion report (\"1.4 billion kroner\").", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260205042453/https://en.wikipedia.org/wiki/Ring_Line_(Oslo)", "kind": "wikipedia", "title": "Ring Line (Oslo) — Wikipedia (whole ring ≈1,348M kr; completed 2006)", "url": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20210308215418/https://web.archive.org/web/20110501173155/http://www.avinet.no/Oslopakke2/database/faktaark_ny.aspx?id=46", "kind": "primary", "publisher": "Oslo Package 2 / Avinet", "quote": "1,348 mill kr (2004-kr) - Ullevål - Storo: 590 mill (2000-kr)", "tier": "primary", "title": "T-baneringen — Faktaark, Oslo Package 2 (Oslopakke 2)", "url": "https://web.archive.org/web/20110501173155/http://www.avinet.no/Oslopakke2/database/faktaark_ny.aspx?id=46", "via": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" }, { "accessedAt": "2026-06-11", "kind": "news", "publisher": "Aftenposten", "quote": "Ringen har kostet 1,4 milliarder kroner og ble bygget over seks år.", "tier": "secondary", "title": "Nå er ringen sluttet — Aftenposten, 21 August 2006", "url": "https://web.archive.org/web/20110604025630/http://www.aftenposten.no/nyheter/iriks/article1428274.ece", "via": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" } ] }, "geometryRef": "oslo-4", "id": "oslo-4-ringen-2006", "kind": "extension", "label": { "en": "Ring Line completed: Storo → Sinsen (ring closed to Carl Berners plass)" }, "notes": "[Opening-date chase 2026-06-13] Day-level variance between sources: Ruter operator timeline (primary) and English Wikipedia state 20 August 2006; Norwegian Wikipedia states 21 August 2006, likely reflecting the Aftenposten day-after newspaper report. Year is unambiguous.", "opened": "2006-08-20", "segment": { "fromStopIndex": 21, "toStopIndex": 22 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260205042453/https://en.wikipedia.org/wiki/Ring_Line_(Oslo)", "kind": "wikipedia", "quote": "On 20 August 2006, the final section opened, from Storo via Sinsen to Carl Berners plass ... the whole project costing NOK 1,348 million", "tier": "secondary", "title": "Ring Line (Oslo) — Wikipedia (ring completed 20 Aug 2006)", "url": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" }, { "accessedAt": "2026-06-13", "kind": "primary", "publisher": "Ruter AS (Oslo/Akershus transit authority)", "quote": "20. august åpnes Sinsen T-banestasjon og strekningen Storo - Sinsen - Carl Berners plass. T-baneringen er sluttet.", "tier": "primary", "title": "Tidslinje — Ruter (archived 2009)", "url": "https://web.archive.org/web/20090220144410/http://ruter.no/Miljo-og-kultur/Tidslinje/", "via": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" } ], "stationCount": 1 }, { "confidence": "high", "constructionStart": "2013", "cost": { "basis": "outturn", "confidence": "high", "nominal": { "currency": "NOK", "isEstimate": false, "value": 1330000000, "year": 2015 }, "notes": "A 1.6 km mostly-underground connector (one new station, Løren, 27 m deep) linking the Ring Line at Sinsen to the Grorud Line at Økern — Oslo's first new metro station in about a decade. Total ≈1.33 billion kroner including ≈150M for Grorud Line station upgrades, funded via Oslo Package 3; built Jun 2013 → opened 3 Apr 2016. Total Lørenbanen project cost; the workflow independently verified only the NOK 357M (2013) groundworks contract (a component), so retained at medium confidence. [Citation chase 2026-06-11] Confirmed by the project owner Sporveien AS (archived 2023-06-06): \"Totalkostnad: 1330 MNOK\" is for Lørenbanen itself; the ~150 MNOK of Grorudbanen station upgrades is an additional cost on top, not included in the 1.33bn figure.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251010071126/https://lokalhistoriewiki.no/wiki/L%C3%B8renbanen", "kind": "other", "title": "Lørenbanen — lokalhistoriewiki.no (totalt 1,33 milliarder kroner; Oslopakke 3; 2013–2016)", "url": "https://lokalhistoriewiki.no/wiki/L%C3%B8renbanen" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20260613164326/https://www.sporveien.no/-innstillinger-/404/", "kind": "primary", "publisher": "Sporveien AS via Wayback Machine", "quote": "Totalkostnad: 1330 MNOK (dette er for selve Lørenbanen, prosjektet omfatter i tillegg tiltak på Grorudbanen for ca. 150 MNOK)", "tier": "primary", "title": "Lørenbanen — Sporveien AS (archived 2023-06-06)", "url": "https://web.archive.org/web/20230606120734/https://sporveien.com/inter/prosjekter/prosjekt?p_document_id=2639628", "via": "https://lokalhistoriewiki.no/wiki/L%C3%B8renbanen" } ] }, "geometryRef": "oslo-4", "id": "oslo-4-lorenbanen-2016", "kind": "extension", "label": { "en": "Lørenbanen opens: Sinsen → Løren → Økern" }, "notes": "[Date chase 2026-06-12] Operator-primary source (Sporveien T-banen, archived tbane.no, 31 May 2013) pins the exact construction start at 3 June 2013; corroborated by no.wp and Aftenposten. Curated year 2013 confirmed. [Opening-date chase 2026-06-13] The tbane.no archived source supports the construction start (3 June 2013), not the opening date, so it is not attached as an opening-date source.", "opened": "2016-04-03", "segment": { "fromStopIndex": 22, "toStopIndex": 24 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251113033440/https://en.wikipedia.org/wiki/L%C3%B8ren_Line", "kind": "wikipedia", "quote": "The line opened on 3 April 2016.", "tier": "secondary", "title": "Løren Line — Wikipedia (opened 3 Apr 2016)", "url": "https://en.wikipedia.org/wiki/L%C3%B8ren_Line" }, { "accessedAt": "2026-06-12", "kind": "primary", "publisher": "Sporveien T-banen (tbane.no)", "quote": "Fra 3. juni 2013 vil Sporveien, Skanska Norge AS og Railcom arbeide med å bygge ny Lørenbane.", "tier": "primary", "title": "3.juni starter byggingen av Lørenbanen — tbane.no (Sporveien T-banen), 31 May 2013", "url": "https://web.archive.org/web/20130810004555/http://www.tbane.no/aktuelt/2013/5/31/3juni-starter-byggingen-av-loerenbanen.aspx", "via": "https://no.wikipedia.org/wiki/L%C3%B8renbanen" }, { "accessedAt": "2026-06-12", "kind": "news", "publisher": "Aftenposten", "quote": "[Cited in en.wp for construction commencement in June 2013; print article p.11, 14 May 2013 — no URL provided in Wikipedia ref, offline print source]", "tier": "secondary", "title": "Aftenposten, 14 May 2013, p.11 (Heidi Marie Fikke) — Sporveien inngår kontrakt verdt 357 NOK med Skanska", "url": "https://www.aftenposten.no/nyheter/oslo/article1428274.ece", "via": "https://en.wikipedia.org/wiki/L%C3%B8ren_Line" } ], "stationCount": 1 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260205042453/https://en.wikipedia.org/wiki/Ring_Line_(Oslo)", "kind": "wikipedia", "tier": "tertiary", "title": "Ring Line (Oslo) — Wikipedia", "url": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251113033440/https://en.wikipedia.org/wiki/L%C3%B8ren_Line", "kind": "wikipedia", "tier": "tertiary", "title": "Løren Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/L%C3%B8ren_Line" } ] }, { "cityId": "oslo", "color": "#32aa35", "displayNumber": "5", "id": "oslo-line-5", "name": { "en": "Line 5 (Vestli ↔ Sognsvann, via the Grorud Line)", "no": "Linje 5 — Grorudbanen / Sognsvannsbanen" }, "phases": [ { "confidence": "medium", "constructionStart": "1932", "geometryRef": "oslo-5", "id": "oslo-5-sognsvannsbanen-tail-1934", "kind": "initial", "label": { "en": "Sognsvannsbanen (outer): Ullevål stadion → Sognsvann" }, "notes": "[Date chase 2026-06-12] 1932/1933 ambiguity: NO Wikipedia ties 1932 to a labor-dispute resolution (15 Dec 1932) enabling restart; EN Wikipedia (Aspenberg 1995 p.17) says work commenced again in 1933. Line opened 10 October 1934. Underlying books (Aspenberg 1995, Stang 1980) offline. [Opening-date chase 2026-06-13] The 22 Sept 1934 date in NO Wikipedia was a kommunal befaring (municipal inspection), not the public/revenue opening (10 Oct 1934).", "opened": "1934-10-10", "segment": { "fromStopIndex": 36, "toStopIndex": 42 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20251010075759/https://en.wikipedia.org/wiki/Sognsvannsbanen", "kind": "wikipedia", "quote": "Work commenced again in 1933 and the line opened on 10 October 1934.", "tier": "secondary", "title": "Sognsvann Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Sognsvannsbanen" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251222123841/https://en.wikipedia.org/wiki/Sognsvann_line", "kind": "wikipedia", "title": "Sognsvann Line — Wikipedia (opened 10 Oct 1934, Majorstuen–Sognsvann)", "url": "https://en.wikipedia.org/wiki/Sognsvann_Line" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20251222123841/https://en.wikipedia.org/wiki/Sognsvann_line", "kind": "other", "publisher": "Wikipedia (EN)", "quote": "Work commenced again in 1933 and the line opened on 10 October 1934.", "tier": "secondary", "title": "Sognsvann line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Sognsvann_line", "via": "https://en.wikipedia.org/wiki/Sognsvann_Line" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613164238/https://no.wikipedia.org/wiki/Sognsvannsbanen", "kind": "other", "publisher": "Wikipedia (NO)", "quote": "Etter at den tidligere nevnte arbeidskonflikten ble løst den 15. desember 1932, kunne arbeidet igjen begynne, og banen sto ferdig den 10. oktober 1934.", "tier": "secondary", "title": "Sognsvannsbanen — Wikipedia (NO)", "url": "https://no.wikipedia.org/wiki/Sognsvannsbanen", "via": "https://en.wikipedia.org/wiki/Sognsvann_Line" } ], "stationCount": 5 }, { "confidence": "low", "constructionStart": "1956", "cost": { "basis": "estimate", "confidence": "low", "nominal": { "currency": "NOK", "isEstimate": true, "value": 221000000, "year": 1954 }, "notes": "The Grorud Line (Tøyen–Grorud, 12 stations, 9.2 km) opened 16 Oct 1966. No per-extension construction cost is published for any of the eastern lines; the only network-level figure is the City Council's 1954 plan, which estimated ≈221M kroner (1954 prices) for the WHOLE four-line eastern metro INCLUDING rolling stock. It is recorded here once, against the Grorud Line, purely as the era's indicative network investment — it is not a Grorud-only cost. Not independently re-verified in the 2026 research pass; retained from prior curation at low confidence.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20250826004542/https://en.wikipedia.org/wiki/Grorud_Line", "kind": "wikipedia", "title": "Grorud Line — Wikipedia (1954 network estimate ≈221M NOK incl. rolling stock; opened 16 Oct 1966)", "url": "https://en.wikipedia.org/wiki/Grorud_Line" } ] }, "geometryRef": "oslo-5", "id": "oslo-5-grorudbanen-1966", "kind": "extension", "label": { "en": "Grorudbanen opens: Tøyen → Carl Berners plass → Grorud" }, "notes": "[Date chase 2026-06-12] Construction confirmed to have started February 1956 at Rødtvet; first section Tøyen–Grorud opened 16 October 1966. Underlying books (Strandholt 1994, Haldsrud 2013) offline.", "opened": "1966-10-16", "segment": { "fromStopIndex": 4, "toStopIndex": 15 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20250826004542/https://en.wikipedia.org/wiki/Grorud_Line", "kind": "wikipedia", "quote": "The first part of the Grorud Line, from Tøyen to Grorud, was opened on 16 October 1966.", "tier": "secondary", "title": "Grorud Line — Wikipedia (Tøyen–Grorud opened 16 Oct 1966)", "url": "https://en.wikipedia.org/wiki/Grorud_Line" } ], "stationCount": 11 }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-grorudbanen-1974", "kind": "extension", "label": { "en": "Grorudbanen extension: Grorud → Rommen (via Romsås)" }, "notes": "[Opening-date chase 2026-06-13] Romsås Station was passed through but did not open until the 18 Aug 1974 Rommen–Stovner extension.", "opened": "1974-03-03", "segment": { "fromStopIndex": 2, "toStopIndex": 4 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20250826004542/https://en.wikipedia.org/wiki/Grorud_Line", "kind": "wikipedia", "quote": "The first extension opened on 3 March 1974 from grorud to Rommen.", "tier": "secondary", "title": "Grorud Line — Wikipedia (Grorud–Rommen 1974; Norwegian WP cites 3 May 1974)", "url": "https://en.wikipedia.org/wiki/Grorud_Line" } ], "stationCount": 2 }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-grorudbanen-stovner-1974", "kind": "extension", "label": { "en": "Grorudbanen extension: Rommen → Stovner" }, "notes": "[Opening-date chase 2026-06-13] Romsås Station opened on this same date (18 Aug 1974).", "opened": "1974-08-18", "segment": { "fromStopIndex": 1, "toStopIndex": 2 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20250826004542/https://en.wikipedia.org/wiki/Grorud_Line", "kind": "wikipedia", "quote": "The second extension took place on 18 August, with the tunnel from Rommen to Stovner.", "tier": "secondary", "title": "Grorud Line — Wikipedia (Rommen–Stovner opened 18 Aug 1974)", "url": "https://en.wikipedia.org/wiki/Grorud_Line" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-grorudbanen-vestli-1975", "kind": "extension", "label": { "en": "Grorudbanen extension: Stovner → Vestli" }, "opened": "1975-12-21", "segment": { "fromStopIndex": 0, "toStopIndex": 1 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20250826004542/https://en.wikipedia.org/wiki/Grorud_Line", "kind": "wikipedia", "quote": "The final opening took place on 21 December 1975 when the tunnel past Stovener was extended to Vestli.", "tier": "secondary", "title": "Grorud Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Grorud_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260103083715/https://en.wikipedia.org/wiki/Vestli_station", "kind": "wikipedia", "title": "Vestli station — Wikipedia (Stovner–Vestli opened 21 Dec 1975)", "url": "https://en.wikipedia.org/wiki/Vestli_station" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-1966-shared-16", "kind": "extension", "label": { "en": "Shared track: common eastern tunnel (Grønland–Jernbanetorget) (opened with line 1 on 1966-05-22)" }, "notes": "Line 5 (Ringen) runs over track that opened on 1966-05-22; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure). [Opening-date chase 2026-06-13] EN Common Tunnel article says 23 May 1966 but is contradicted by the Lambertseter Line article and NO Wikipedia, which both give 22 May 1966.", "opened": "1966-05-22", "segment": { "fromStopIndex": 15, "toStopIndex": 17 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260116101049/https://en.wikipedia.org/wiki/Lambertseter_Line", "kind": "wikipedia", "quote": "The last trams operated during the night between 17 and 18 May 1966. ... opened as the first part of the Oslo Metro on 22 May 1966 ... Building the new stations commenced in October 1963 and were completed by the end of 1965, with upgrade costs of 11 million kroner, excluding third rail.", "tier": "secondary", "title": "Lambertseter Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Lambertseter_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260512160603/https://no.wikipedia.org/wiki/T-banen_i_Oslo", "kind": "wikipedia", "title": "T-banen i Oslo — Wikipedia (no) (eastern lines reached Jernbanetorget 22 May 1966)", "url": "https://no.wikipedia.org/wiki/T-banen_i_Oslo" } ] }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-1987-shared-18", "kind": "extension", "label": { "en": "Shared track: Stortinget infill on the common tunnel (opened with line 1 on 1987-03-07)" }, "notes": "Line 5 (Ringen) runs over track that opened on 1987-03-07; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure). [Opening-date chase 2026-06-13] Station first opened as 'Sentrum' on 9 Jan 1977, closed Feb 1983, then reopened as Stortinget on 7 Mar 1987 — the relevant through-running reopening.", "opened": "1987-03-07", "segment": { "fromStopIndex": 17, "toStopIndex": 19 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251229154246/https://en.wikipedia.org/wiki/Stortinget_station", "kind": "wikipedia", "title": "Stortinget station — Wikipedia (opened as Sentrum 1977; reopened as Stortinget 7 Mar 1987)", "url": "https://en.wikipedia.org/wiki/Stortinget_station" } ] }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-1928-shared-19", "kind": "extension", "label": { "en": "Shared track: central tunnel (Majorstuen–Nationaltheatret) (opened with line 1 on 1928-06-27)" }, "notes": "Line 5 (Ringen) runs over track that opened on 1928-06-27; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure). [Opening-date chase 2026-06-13] Day/month uncertain: EN Common Tunnel has internal conflict (27 June text vs 28 June infobox); NO Holmenkollen/Nationaltheatret sources give 6 June and 26 June. Year 1928 is solid.", "opened": "1928-06-27", "segment": { "fromStopIndex": 19, "toStopIndex": 20 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112102036/https://en.wikipedia.org/wiki/Common_Tunnel", "kind": "wikipedia", "title": "Common Tunnel — Wikipedia (western section opened 1928)", "url": "https://en.wikipedia.org/wiki/Common_Tunnel" } ] }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-1934-shared-21", "kind": "extension", "label": { "en": "Shared track: Sognsvannsbanen (Majorstuen–Ullevål stadion) (opened with line 4 on 1934-10-10)" }, "notes": "Line 5 (Ringen) runs over track that opened on 1934-10-10; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1934-10-10", "segment": { "fromStopIndex": 20, "toStopIndex": 23 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20251010075759/https://en.wikipedia.org/wiki/Sognsvannsbanen", "kind": "wikipedia", "quote": "Work commenced again in 1933 and the line opened on 10 October 1934.", "tier": "secondary", "title": "Sognsvann Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Sognsvannsbanen" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260218144418/https://no.wikipedia.org/wiki/Sognsvannsbanen", "kind": "wikipedia", "title": "Sognsvannsbanen — Wikipedia (no) (opened 10 Oct 1934)", "url": "https://no.wikipedia.org/wiki/Sognsvannsbanen" } ] }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-2003-shared-24", "kind": "extension", "label": { "en": "Shared track: Ring Line (Ullevål–Storo via Nydalen) (opened with line 4 on 2003-08-20)" }, "notes": "Line 5 (Ringen) runs over track that opened on 2003-08-20; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "2003-08-20", "segment": { "fromStopIndex": 23, "toStopIndex": 25 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260205042453/https://en.wikipedia.org/wiki/Ring_Line_(Oslo)", "kind": "wikipedia", "quote": "The first section opened from Ullevål stadion via Nydalen to Storo on 20 August 2003 ... costing NOK 590 million", "tier": "secondary", "title": "Ring Line (Oslo) — Wikipedia (stage 1 opened 20 Aug 2003)", "url": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" } ] }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-2006-shared-26", "kind": "extension", "label": { "en": "Shared track: Ring Line (Storo–Sinsen–Carl Berners) (opened with line 4 on 2006-08-20)" }, "notes": "Line 5 (Ringen) runs over track that opened on 2006-08-20; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "2006-08-20", "segment": { "fromStopIndex": 25, "toStopIndex": 28 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260205042453/https://en.wikipedia.org/wiki/Ring_Line_(Oslo)", "kind": "wikipedia", "quote": "On 20 August 2006, the final section opened, from Storo via Sinsen to Carl Berners plass ... the whole project costing NOK 1,348 million", "tier": "secondary", "title": "Ring Line (Oslo) — Wikipedia (ring completed 20 Aug 2006)", "url": "https://en.wikipedia.org/wiki/Ring_Line_(Oslo)" } ] }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-1966-shared-28", "kind": "extension", "label": { "en": "Shared track: common eastern tunnel (Grønland–Jernbanetorget) (opened with line 1 on 1966-05-22)" }, "notes": "Line 5 (Ringen) runs over track that opened on 1966-05-22; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1966-05-22", "segment": { "fromStopIndex": 28, "toStopIndex": 30 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20260116101049/https://en.wikipedia.org/wiki/Lambertseter_Line", "kind": "wikipedia", "quote": "The last trams operated during the night between 17 and 18 May 1966. ... opened as the first part of the Oslo Metro on 22 May 1966 ... Building the new stations commenced in October 1963 and were completed by the end of 1965, with upgrade costs of 11 million kroner, excluding third rail.", "tier": "secondary", "title": "Lambertseter Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Lambertseter_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260512160603/https://no.wikipedia.org/wiki/T-banen_i_Oslo", "kind": "wikipedia", "title": "T-banen i Oslo — Wikipedia (no) (eastern lines reached Jernbanetorget 22 May 1966)", "url": "https://no.wikipedia.org/wiki/T-banen_i_Oslo" } ] }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-1987-shared-31", "kind": "extension", "label": { "en": "Shared track: Stortinget infill on the common tunnel (opened with line 1 on 1987-03-07)" }, "notes": "Line 5 (Ringen) runs over track that opened on 1987-03-07; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1987-03-07", "segment": { "fromStopIndex": 30, "toStopIndex": 32 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251229154246/https://en.wikipedia.org/wiki/Stortinget_station", "kind": "wikipedia", "title": "Stortinget station — Wikipedia (opened as Sentrum 1977; reopened as Stortinget 7 Mar 1987)", "url": "https://en.wikipedia.org/wiki/Stortinget_station" } ] }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-1928-shared-32", "kind": "extension", "label": { "en": "Shared track: central tunnel (Majorstuen–Nationaltheatret) (opened with line 1 on 1928-06-27)" }, "notes": "Line 5 (Ringen) runs over track that opened on 1928-06-27; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1928-06-27", "segment": { "fromStopIndex": 32, "toStopIndex": 33 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112102036/https://en.wikipedia.org/wiki/Common_Tunnel", "kind": "wikipedia", "title": "Common Tunnel — Wikipedia (western section opened 1928)", "url": "https://en.wikipedia.org/wiki/Common_Tunnel" } ] }, { "confidence": "low", "geometryRef": "oslo-5", "id": "oslo-5-1934-shared-34", "kind": "extension", "label": { "en": "Shared track: Sognsvannsbanen (Majorstuen–Ullevål stadion) (opened with line 4 on 1934-10-10)" }, "notes": "Line 5 (Ringen) runs over track that opened on 1934-10-10; attributed for map continuity (no separate cost, to avoid double-counting shared infrastructure).", "opened": "1934-10-10", "segment": { "fromStopIndex": 33, "toStopIndex": 36 }, "sources": [ { "accessedAt": "2026-06-05", "archivedUrl": "https://web.archive.org/web/20251010075759/https://en.wikipedia.org/wiki/Sognsvannsbanen", "kind": "wikipedia", "quote": "Work commenced again in 1933 and the line opened on 10 October 1934.", "tier": "secondary", "title": "Sognsvann Line - Wikipedia", "url": "https://en.wikipedia.org/wiki/Sognsvannsbanen" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260218144418/https://no.wikipedia.org/wiki/Sognsvannsbanen", "kind": "wikipedia", "title": "Sognsvannsbanen — Wikipedia (no) (opened 10 Oct 1934)", "url": "https://no.wikipedia.org/wiki/Sognsvannsbanen" } ] } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20250826004542/https://en.wikipedia.org/wiki/Grorud_Line", "kind": "wikipedia", "tier": "tertiary", "title": "Grorud Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Grorud_Line" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251222123841/https://en.wikipedia.org/wiki/Sognsvann_line", "kind": "wikipedia", "tier": "tertiary", "title": "Sognsvann Line — Wikipedia", "url": "https://en.wikipedia.org/wiki/Sognsvann_Line" } ] } ], "name": { "en": "Oslo", "no": "Oslo" } }