{ "bbox": [ 13.18, 52.41, 13.64, 52.6 ], "center": [ 13.4, 52.52 ], "country": "Germany", "defaultZoom": 10, "homeCurrency": "EUR", "id": "berlin", "lines": [ { "cityId": "berlin", "color": "#7DAD4C", "displayNumber": "U1", "id": "berlin-line-U1", "name": { "de": "U1 — Stammstrecke (Hochbahn)", "en": "U1 (Uhlandstraße ↔ Warschauer Straße)" }, "phases": [ { "confidence": "medium", "constructionStart": "1896", "geometryRef": "berlin-U1", "id": "berlin-u1-1902-stammstrecke", "kind": "initial", "label": { "en": "Berlin's first U-Bahn (Stammstrecke): Gleisdreieck → Warschauer Brücke" }, "notes": "Built in the Goldmark/Reichsmark era. No reliable, natively-sourced construction cost was found; the prior euro figure was era-mislabeled (the period used Goldmark/Reichsmark) and is not reliably convertible to 2026€, so no cost is recorded. [Date chase 2026-06-12] Groundbreaking dated to 10 September 1896 (Gitschiner Straße) by EN and DE Wikipedia; DE article attributes the surrounding history to Bousset, Die Berliner U-Bahn (1935), an offline print source. [Opening-date chase 2026-06-13] 15 February 1902 was the 'Ministerfahrt' (VIP ceremonial inaugural run attended by Prussian minister Karl von Thielen); the public revenue-service opening was 18 February 1902.", "opened": "1902-02-18", "segment": { "fromStopIndex": 5, "toStopIndex": 12 }, "sources": [ { "accessedAt": "2026-06-06", "archivedUrl": "https://web.archive.org/web/20251219132430/https://de.wikipedia.org/wiki/U-Bahn-Linie_1_(Berlin)", "kind": "wikipedia", "quote": "Am 18. Februar 1902 wurde die erste Teilstrecke der Berliner U-Bahn offiziell eröffnet (Stralauer Tor – Potsdamer Platz).", "tier": "secondary", "title": "U-Bahn-Linie 1 (Berlin) — Wikipedia (DE)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_1_(Berlin)" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260215112230/https://en.wikipedia.org/wiki/U1_(Berlin_U-Bahn)", "kind": "wikipedia", "title": "U1 (Berlin U-Bahn) — Wikipedia (Stammstrecke opened 18 Feb 1902)", "url": "https://en.wikipedia.org/wiki/U1_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260203065648/https://de.wikipedia.org/wiki/U-Bahn-Linie_U1_(Berlin)", "kind": "other", "publisher": "Wikipedia (DE)", "quote": "Der erste Spatenstich war am 10. September 1896 in der Gitschiner Straße.", "tier": "secondary", "title": "U-Bahn-Linie U1 (Berlin) — Wikipedia (DE)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U1_(Berlin)", "via": "https://de.wikipedia.org/wiki/U-Bahn-Linie_1_(Berlin)" } ], "stationCount": 7 }, { "confidence": "low", "geometryRef": "berlin-U1", "id": "berlin-u1-1913-wittenbergplatz", "kind": "extension", "label": { "en": "West branch: Gleisdreieck → Wittenbergplatz → Uhlandstraße" }, "opened": "1913-10-12", "segment": { "fromStopIndex": 1, "toStopIndex": 5 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260215112230/https://en.wikipedia.org/wiki/U1_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "This branch opened on 12 October 1913 along with the Dahlem line", "tier": "secondary", "title": "U1 (Berlin U-Bahn) — Wikipedia (Wittenbergplatz–Uhlandstraße branch, 12 Oct 1913)", "url": "https://en.wikipedia.org/wiki/U1_(Berlin_U-Bahn)" } ], "stationCount": 3 }, { "confidence": "low", "geometryRef": "berlin-U1", "id": "berlin-u1-1961-kurfurstendamm", "kind": "extension", "label": { "en": "Kurfürstendamm station inserted on the western branch" }, "notes": "[Opening-date chase 2026-06-13] Originally scheduled for 2 September 1961 (with U9/Line G); after the Berlin Wall was erected on 13 August 1961 the opening was moved forward to 28 August 1961, which is the actual revenue-service date.", "opened": "1961-08-28", "segment": { "fromStopIndex": 0, "toStopIndex": 1 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260215112230/https://en.wikipedia.org/wiki/U1_(Berlin_U-Bahn)", "kind": "wikipedia", "title": "U1 (Berlin U-Bahn) — Wikipedia (Kurfürstendamm opened 28 Aug 1961)", "url": "https://en.wikipedia.org/wiki/U1_(Berlin_U-Bahn)" } ], "stationCount": 1 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260215112230/https://en.wikipedia.org/wiki/U1_(Berlin_U-Bahn)", "kind": "wikipedia", "tier": "secondary", "title": "U1 (Berlin U-Bahn) — Wikipedia", "url": "https://en.wikipedia.org/wiki/U1_(Berlin_U-Bahn)" } ] }, { "cityId": "berlin", "color": "#DA421E", "displayNumber": "U2", "id": "berlin-line-U2", "name": { "de": "U2 — Stammstrecke / Charlottenburg / Centrumslinie", "en": "U2 (Pankow ↔ Ruhleben)" }, "phases": [ { "confidence": "medium", "constructionStart": "1896", "geometryRef": "berlin-U2", "id": "berlin-u2-1902-zoo", "kind": "initial", "label": { "en": "Original 1902 trunk: Potsdamer Platz → Zoologischer Garten → Knie" }, "notes": "[Date chase 2026-06-12] First sod (erster Spatenstich) turned 10 September 1896 in Gitschiner Straße; DE Wikipedia cites Bousset, 'Die Berliner U-Bahn' (1935) for context. [Opening-date chase 2026-06-13] Phase label spans the full Potsdamer Platz–Zoo–Knie corridor; the trunk's first segment opened 18 Feb 1902, extended to Zoo in March 1902, and reached Knie on 14 Dec 1902.", "opened": "1902-12-14", "segment": { "fromStopIndex": 13, "toStopIndex": 21 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "On 18 February 1902 the first stage of the Berlin U-Bahn was officially opened (Stralauer Tor–Potsdamer Platz).", "tier": "secondary", "title": "U2 (Berlin U-Bahn) — Wikipedia (1902 trunk to Knie/Ernst-Reuter-Platz)", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613160913/https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "kind": "other", "publisher": "Wikipedia (English)", "quote": "After years of negotiations, construction began on a mainly elevated railway line on 10 September 1896.", "tier": "secondary", "title": "History of the Berlin U-Bahn — Wikipedia", "url": "https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ], "stationCount": 8 }, { "confidence": "medium", "geometryRef": "berlin-U2", "id": "berlin-u2-1908-charlottenburg", "kind": "extension", "label": { "en": "Charlottenburg extension: Knie → Wilhelmplatz → Reichskanzlerplatz" }, "notes": "[Opening-date chase 2026-06-13] 1908-03-16 is the ceremonial 'minister ride' opening; public/revenue service opened 1908-03-29 per both Wikipedia sources. Consider correcting day to 1908-03-29 for revenue-opening consistency.", "opened": "1908-03-16", "segment": { "fromStopIndex": 21, "toStopIndex": 24 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "16 March 1908: Emperor Wilhelm II opened the western extension. \"It was officially inaugurated on 29 March 1908.\"", "tier": "secondary", "title": "U2 (Berlin U-Bahn) — Wikipedia (Charlottenburg extension opened 1906/1908)", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613160913/https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "kind": "other", "publisher": "Wikipedia", "quote": "Emperor Wilhelm II opened the line on 16 March 1908, and the inaugural trip became known as the 'minister ride'. It was opened to the public on 29 March 1908.", "tier": "secondary", "title": "History of the Berlin U-Bahn — Wikipedia", "url": "https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ], "stationCount": 3 }, { "confidence": "medium", "geometryRef": "berlin-U2", "id": "berlin-u2-1913-spittelmarkt", "kind": "extension", "label": { "en": "Centrumslinie east: Potsdamer Platz → Spittelmarkt → Alexanderplatz → Schönhauser Allee" }, "notes": "Built in the Goldmark/Reichsmark era. No reliable, natively-sourced construction cost was found; the prior euro figure was era-mislabeled (the period used Goldmark/Reichsmark) and is not reliably convertible to 2026€, so no cost is recorded. [Opening-date chase 2026-06-13] Spittelmarkt–Alexanderplatz opened 1 July 1913; the northern extension to Nordring (Schönhauser Allee) followed 27 July 1913, the date covering the full phase.", "opened": "1913-07-27", "segment": { "fromStopIndex": 2, "toStopIndex": 13 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "1 July 1913: Extended from Spittelmarkt to Alexanderplatz", "tier": "secondary", "title": "U2 (Berlin U-Bahn) — Wikipedia (east to Schönhauser Allee 27 Jul 1913)", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613160913/https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "kind": "other", "publisher": "Wikipedia", "quote": "27 July 1913: Alexanderplatz – Nordring", "tier": "secondary", "title": "History of the Berlin U-Bahn — Wikipedia", "url": "https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ], "stationCount": 7 }, { "confidence": "medium", "geometryRef": "berlin-U2", "id": "berlin-u2-1929-ruhleben", "kind": "extension", "label": { "en": "West to Ruhleben: Reichskanzlerplatz → Olympia-Stadion → Ruhleben" }, "opened": "1929-12-22", "segment": { "fromStopIndex": 24, "toStopIndex": 27 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "22 December 1929: Extended to Ruhleben terminus \"on an embankment.\"", "tier": "secondary", "title": "U2 (Berlin U-Bahn) — Wikipedia (Neu-Westend 1922, Stadion 1913/1929, Ruhleben 22 Dec 1929)", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613160913/https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "kind": "other", "publisher": "Wikipedia", "quote": "22 December 1929: Stadion – Ruhleben", "tier": "secondary", "title": "History of the Berlin U-Bahn — Wikipedia", "url": "https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ], "stationCount": 3 }, { "confidence": "medium", "geometryRef": "berlin-U2", "id": "berlin-u2-1930-vinetastrasse", "kind": "extension", "label": { "en": "North to Pankow (Vinetastraße): Schönhauser Allee → Vinetastraße" }, "notes": "[Opening-date chase 2026-06-13] History of Berlin U-Bahn chronology gives 29 June 1930 for Nordring–Pankow (Vinetastraße); U2 article only says 'built in 1930'. Better-sourced specific date is 1930-06-29; consider correcting day/month.", "opened": "1930-07-29", "segment": { "fromStopIndex": 1, "toStopIndex": 2 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "1930: Vinetastraße station built to facilitate train reversals.", "tier": "secondary", "title": "U2 (Berlin U-Bahn) — Wikipedia (Vinetastraße opened 1930)", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613160913/https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "kind": "other", "publisher": "Wikipedia", "quote": "29 June 1930: Nordring – Pankow (Vinetastraße)", "tier": "secondary", "title": "History of the Berlin U-Bahn — Wikipedia", "url": "https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ], "stationCount": 1 }, { "confidence": "medium", "geometryRef": null, "id": "berlin-u2-1993-reunification", "kind": "reopening", "label": { "en": "Divided line reconnected after reunification: West (Ruhleben–Wittenbergplatz) + East (Vinetastraße–Mohrenstraße) through-service restored. Severed at the sector border 1961–1993; no new geometry." }, "opened": "1993-11-13", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "Finally, after numerous renovations, conversions and demolitions, the two lines were reconnected on 13 November 1993.", "tier": "secondary", "title": "U2 (Berlin U-Bahn) — Wikipedia (reconnected 13 Nov 1993)", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613160913/https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "kind": "other", "publisher": "Wikipedia", "quote": "The amalgamated line was reopened on 13 November 1993.", "tier": "secondary", "title": "History of the Berlin U-Bahn — Wikipedia", "url": "https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ], "stationCount": 0 }, { "confidence": "medium", "geometryRef": "berlin-U2", "id": "berlin-u2-1998-mendelssohn", "kind": "extension", "label": { "en": "Mendelssohn-Bartholdy-Park station inserted (Gleisdreieck–Potsdamer Platz)" }, "notes": "[Opening-date chase 2026-06-13] History article notes engineering completion 2 Oct 1998; public opening date is 1 Oct 1998 per the U2 article.", "opened": "1998-10-01", "segment": { "fromStopIndex": 14, "toStopIndex": 15 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "A station with the provisional name of Hafenplatz was built by the BVG with two side platforms and opened as Mendelssohn-Bartholdy-Park station on 1 October 1998.", "tier": "secondary", "title": "U2 (Berlin U-Bahn) — Wikipedia (Mendelssohn-Bartholdy-Park opened 1 Oct 1998)", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613160913/https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "kind": "other", "publisher": "Wikipedia", "quote": "The U2 Mendelssohn-Bartholdy-Park station opened in October 1998, and a short portion from Vinetastraße to Pankow opened in September 2000.", "tier": "secondary", "title": "History of the Berlin U-Bahn — Wikipedia", "url": "https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ], "stationCount": 1 }, { "confidence": "medium", "constructionStart": "1997", "cost": { "basis": "outturn", "confidence": "high", "nominal": { "currency": "DEM", "isEstimate": true, "value": 105000000, "year": 2000 }, "notes": "The 0.9 km extension from Vinetastraße to the Pankow S-Bahn interchange cost ≈ 105 million Deutsche Mark (≈ €54m at the fixed 1.95583 DM/€ conversion). Opened 16 Sep 2000. Recorded in native Deutsche Mark (≈ €54M). [Citation chase 2026-06-11] The DM 105 million figure is the actual final cost (outturn); the original estimate/budget was DM 126 million, so the project came in roughly 17% under budget. The federal government covered about three-quarters of the cost. Confirmed by the BVG and the Berlin Senate via Berliner Zeitung (13 Sep 2000), with Wikipedia secondary.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "title": "U2 (Berlin U-Bahn) — Wikipedia (Pankow extension ≈105M DM, opened 16 Sep 2000)", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20260613161030/https://www.berliner-zeitung.de/category/archiv", "kind": "news", "publisher": "Berliner Zeitung", "quote": "\"Wir gehen davon aus, dass die Baukosten mindestens zehn Prozent unter den veranschlagten 126 Millionen Mark liegen\", sagte ein Mitarbeiter der Senatsverwaltung für Stadtentwicklung zur \"Berliner Zeitung\". Nach Angaben der Berliner Verkehrsbetriebe (BVG) wird die Strecke sogar nur 105 Millionen Mark kosten.", "tier": "primary", "title": "Am Sonnabend sind die Pankower am Zug", "url": "https://web.archive.org/web/20150924053647/http://www.berliner-zeitung.de/archiv/endspurt-auf-der-baustelle--die-strecke-von-vinetastrasse-nach-bahnhof-pankow-wird-puenktlich-fertig---und-billiger-u-bahn-linie-2--ab-sonnabend-sind-die-pankower-am-zug,10810590,9833154.html", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ] }, "geometryRef": "berlin-U2", "id": "berlin-u2-2000-pankow", "kind": "extension", "label": { "en": "North terminus to Pankow S-Bahn: Vinetastraße → Pankow" }, "notes": "[Date chase 2026-06-12] Ceremonial Spatenstich 13 June 1997 (Bausenator Peter Klemann); actual construction of the missing tunnel segment and Pankow station began May 1997 per berliner-untergrundbahn.de. Earlier excavation work dated to 1989 (EN History article), but construction proper is 1997. [Opening-date chase 2026-06-13] Archived Berliner Zeitung URL was inaccessible; de.Wikipedia Bahnhof Berlin-Pankow corroborates 16 Sep 2000 directly.", "opened": "2000-09-16", "segment": { "fromStopIndex": 0, "toStopIndex": 1 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "16 September 2000: \"the new line was opened\" to Pankow S-Bahn station. Cost: \"DM 105 million\" (down from \"DM 126 million\" estimate).", "tier": "secondary", "title": "U2 (Berlin U-Bahn) — Wikipedia (Pankow opened 16 Sep 2000)", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260112081617/https://de.wikipedia.org/wiki/Bahnhof_Berlin-Pankow", "kind": "other", "publisher": "Wikipedia (Deutsch)", "quote": "Die Bauarbeiten begannen 1997. Für den Bau der 1,5 Kilometer langen Tunnelstrecke wurden drei Jahre benötigt, parallel dazu wurde der U-Bahnhof Pankow errichtet. Der neue Endbahnhof der Linie U2 wurde am 16. September 2000 eröffnet.", "tier": "secondary", "title": "Bahnhof Berlin-Pankow — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/Bahnhof_Berlin-Pankow", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20170120121643/http://www.berliner-untergrundbahn.de:80/st-201.htm", "kind": "other", "publisher": "berliner-untergrundbahn.de (Marcus Schomacker)", "quote": "Im Mai 1997 endlich begann der Bau des noch fehlenden Tunnelstücks und des Bahnhofs Pankow.", "tier": "tertiary", "title": "Berlins U-Bahnstrecken. U2 Die Pankower U-Bahn — berliner-untergrundbahn.de", "url": "http://www.berliner-untergrundbahn.de/st-201.htm", "via": "https://de.wikipedia.org/wiki/Bahnhof_Berlin-Pankow" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613160913/https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "kind": "other", "publisher": "Wikipedia (English)", "quote": "The U2 was extended from Vinetastraße to Pankow; the connection opened on 16 September 2000. Excavation began in 1989, and construction began in 1997.", "tier": "secondary", "title": "History of the Berlin U-Bahn — Wikipedia", "url": "https://en.wikipedia.org/wiki/History_of_the_Berlin_U-Bahn", "via": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ], "stationCount": 1 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260128013500/https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)", "kind": "wikipedia", "tier": "secondary", "title": "U2 (Berlin U-Bahn) — Wikipedia", "url": "https://en.wikipedia.org/wiki/U2_(Berlin_U-Bahn)" } ] }, { "cityId": "berlin", "color": "#16683D", "displayNumber": "U3", "id": "berlin-line-U3", "name": { "de": "U3 — Dahlemer Linie / Wilmersdorf–Dahlem-Bahn", "en": "U3 (Krumme Lanke ↔ Warschauer Straße)" }, "phases": [ { "confidence": "medium", "constructionStart": "1910", "geometryRef": "berlin-U3", "id": "berlin-u3-1913-dahlem", "kind": "initial", "label": { "en": "Wilmersdorf–Dahlem railway: Wittenbergplatz → Thielplatz (Freie Universität)" }, "notes": "[Date chase 2026-06-12] A ceremonial groundbreaking (Grundsteinlegung) was held at Hohenzollernplatz on 5 October 1909, but actual construction works (Arbeiten) began in summer 1910 per both Wikipedia sources; the 1910 year stands. [Opening-date chase 2026-06-13] berliner-untergrundbahn.de distinguishes a ceremonial inauguration (Einweihungsfest) on 9 Oct 1913 from the public/revenue-service opening on 12 Oct 1913; the curated date is the revenue-service date.", "opened": "1913-10-12", "segment": { "fromStopIndex": 3, "toStopIndex": 13 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112193248/https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The lines to Thielplatz and to Uhlandstrasse both opened on 12 October 1913. Together they were about 10 kilometres (6.2 mi) long.", "tier": "secondary", "title": "U3 (Berlin U-Bahn) — Wikipedia (Wittenbergplatz–Thielplatz opened 12 Oct 1913)", "url": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613161038/https://de.wikipedia.org/wiki/Geschichte_der_Berliner_U-Bahn", "kind": "other", "publisher": "Wikipedia (German)", "quote": "Im Sommer 1910 begannen die Arbeiten.", "tier": "tertiary", "title": "Geschichte der Berliner U-Bahn — Wikipedia (de)", "url": "https://de.wikipedia.org/wiki/Geschichte_der_Berliner_U-Bahn", "via": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20161015070709/http://www.berliner-untergrundbahn.de:80/st-113.htm", "kind": "other", "publisher": "berliner-untergrundbahn.de (fan/enthusiast site)", "quote": "Am 5. Oktober 1909 erfolgte eben dort die feierliche Grundsteinlegung, wonach der Bau auf gesamter Länge begonnen werden konnte.", "tier": "tertiary", "title": "Die Wilmersdorfer Untergrundbahn — Berliner Untergrundbahn", "url": "http://www.berliner-untergrundbahn.de/st-113.htm", "via": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260310162403/https://de.wikipedia.org/wiki/U-Bahn-Linie_U3_(Berlin)", "kind": "other", "publisher": "Wikipedia (Deutsch)", "quote": "Beide Strecken, sowohl die zum Thielplatz als auch die zur Uhlandstraße, wurden am 12. Oktober 1913 eröffnet.", "tier": "secondary", "title": "U-Bahn-Linie U3 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U3_(Berlin)", "via": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" } ], "stationCount": 10 }, { "confidence": "medium", "geometryRef": "berlin-U3", "id": "berlin-u3-1929-krummelanke", "kind": "extension", "label": { "en": "South extension: Thielplatz → Krumme Lanke (land/cost gifted by the Sommerfeld estate)" }, "opened": "1929-12-22", "segment": { "fromStopIndex": 0, "toStopIndex": 3 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112193248/https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "the extension to Krumme Lanke via Onkel Toms Hütte and Oskar-Helene-Heim was completed on 22 December 1929", "tier": "secondary", "title": "U3 (Berlin U-Bahn) — Wikipedia (Thielplatz–Krumme Lanke opened 22 Dec 1929)", "url": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260310162403/https://de.wikipedia.org/wiki/U-Bahn-Linie_U3_(Berlin)", "kind": "other", "publisher": "Wikipedia (Deutsch)", "quote": "Dieser Abschnitt ging am 22. Dezember 1929 in Betrieb.", "tier": "secondary", "title": "U-Bahn-Linie U3 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U3_(Berlin)", "via": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" } ], "stationCount": 3 }, { "confidence": "high", "geometryRef": "berlin-U3", "id": "berlin-u3-2018-warschauer", "kind": "extension", "label": { "en": "U3 service extended over the historic Stammstrecke to Warschauer Straße (track shared with U1; tunnel/viaduct cost carried on U1)" }, "notes": "[Opening-date chase 2026-06-13] Operational service extension over existing U1 infrastructure (no new track); curated date is the first day the U3 designation ran to Warschauer Strasse. Tagesspiegel (7 Mar 2018) is forward-looking ('voraussichtlich').", "opened": "2018-05-07", "segment": { "fromStopIndex": 13, "toStopIndex": 23 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112193248/https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "the U3 was extended to run with the U1 all the way to Warschauer Straße. The extension ... was facilitated by ... BVG Class IK ... sets becoming available in April 2018.", "tier": "secondary", "title": "U3 (Berlin U-Bahn) — Wikipedia (extended to Warschauer Straße 7 May 2018)", "url": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260310162403/https://de.wikipedia.org/wiki/U-Bahn-Linie_U3_(Berlin)", "kind": "other", "publisher": "Wikipedia (Deutsch)", "quote": "Seit dem 7. Mai 2018 fährt die U3 über die Hochbahn durch Kreuzberg bis zur Station Warschauer Straße.", "tier": "secondary", "title": "U-Bahn-Linie U3 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U3_(Berlin)", "via": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20220311131945/https://www.tagesspiegel.de/berlin/nahverkehr-in-berlin-u3-faehrt-ab-mai-von-dahlem-bis-zur-warschauer-strasse/21045262.html", "kind": "news", "publisher": "Der Tagesspiegel", "quote": "Voraussichtlich ab 7. Mai [erhöht die BVG] den Takt auf der Hochbahn zwischen der westlichen City, Kreuzberg und Friedrichshain", "tier": "secondary", "title": "U3 fährt ab Mai von Dahlem bis zur Warschauer Straße — Der Tagesspiegel", "url": "https://www.tagesspiegel.de/berlin/nahverkehr-in-berlin-u3-faehrt-ab-mai-von-dahlem-bis-zur-Warschauer-strasse/21045262.html", "via": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" } ], "stationCount": 10 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251112193248/https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)", "kind": "wikipedia", "tier": "secondary", "title": "U3 (Berlin U-Bahn) — Wikipedia", "url": "https://en.wikipedia.org/wiki/U3_(Berlin_U-Bahn)" } ] }, { "cityId": "berlin", "color": "#F0D722", "displayNumber": "U4", "id": "berlin-line-U4", "name": { "de": "U4 — Schöneberger Linie", "en": "U4 (Nollendorfplatz ↔ Innsbrucker Platz)" }, "phases": [ { "confidence": "medium", "constructionStart": "1908", "geometryRef": "berlin-U4", "id": "berlin-u4-1910", "kind": "initial", "label": { "en": "Schöneberg's own line opens: Nollendorfplatz ↔ Innsbrucker Platz (whole line)" }, "notes": "Built in the Goldmark/Reichsmark era. The workflow found a ~13.9 million Goldmark figure for this 1910 Wilmersdorf–Dahlem (Kurfürstendamm) construction, but Goldmark→2026€ conversion across two world wars and hyperinflation is unreliable, so no cost is charted. [Date chase 2026-06-12] Groundbreaking ceremony 8 December 1908; Schöneberg built the line itself. German Wikipedia U4 article does not exist; other fan/operator sites (berliner-linienchronik.de, stadtschnellbahn-berlin.de, bvg.de, etc.) were inaccessible. No new citable source could be chained from the Wikipedia construction-start sentences (no inline citations attached). [Opening-date chase 2026-06-13] Opening ceremonies were subdued (the mayor had died a month earlier), but 1 Dec 1910 is the public revenue-service opening with no separate ceremonial date.", "opened": "1910-12-01", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260317152411/https://en.wikipedia.org/wiki/U4_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "A groundbreaking ceremony was held on 8 December 1908. ... on 1 December 1910, the line was put into operation ... the line was opened on 1 December 1910 as Line BI.", "tier": "secondary", "title": "U4 (Berlin U-Bahn) — Wikipedia (opened 1 Dec 1910)", "url": "https://en.wikipedia.org/wiki/U4_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161127/https://de.wikipedia.org/wiki/U-Bahn-Linie_U4_(Berlin)", "kind": "other", "publisher": "Wikipedia (German)", "quote": "Nach bereits zwei Jahren Bauzeit konnte die Strecke am 1. Dezember 1910 eröffnet werden.", "tier": "secondary", "title": "U-Bahn-Linie U4 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U4_(Berlin)", "via": "https://en.wikipedia.org/wiki/U4_(Berlin_U-Bahn)" } ], "stationCount": 5 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260317152411/https://en.wikipedia.org/wiki/U4_(Berlin_U-Bahn)", "kind": "wikipedia", "tier": "secondary", "title": "U4 (Berlin U-Bahn) — Wikipedia", "url": "https://en.wikipedia.org/wiki/U4_(Berlin_U-Bahn)" } ] }, { "cityId": "berlin", "color": "#7E5330", "displayNumber": "U5", "id": "berlin-line-U5", "name": { "de": "U5 — Linie E / Lückenschluss", "en": "U5 (Hauptbahnhof ↔ Hönow)" }, "phases": [ { "confidence": "high", "constructionStart": "1927", "geometryRef": "berlin-U5", "id": "berlin-u5-1930-linie-e", "kind": "initial", "label": { "en": "Linie E opens: Alexanderplatz → Friedrichsfelde" }, "notes": "Built in the Goldmark/Reichsmark era. No reliable, natively-sourced construction cost was found; the prior euro figure was era-mislabeled (the period used Goldmark/Reichsmark) and is not reliably convertible to 2026€, so no cost is recorded. [Date chase 2026-06-12] Construction start of 1927 is corroborated by a primary source: the 1930 Linie E opening booklet (u-bahn-archiv.de), which states Rohbauarbeiten (shell construction) began 'im Jahre 1927'. [Opening-date chase 2026-06-13] Primary source u-bahn-archiv.de has a TLS/dead-link error but its document title names 21 December 1930 and DE Wikipedia cites it for that date.", "opened": "1930-12-21", "segment": { "fromStopIndex": 6, "toStopIndex": 15 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611112518/https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "Construction began in May 1927 for the seven-kilometer route from Alexanderplatz to Friedrichsfelde, with the opening taking place on 21 December 1930. Originally designated as Line E.", "tier": "secondary", "title": "U5 (Berlin U-Bahn) — Wikipedia (opened 21 Dec 1930)", "url": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260104121437/https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)", "kind": "other", "publisher": "Wikipedia", "quote": "Die Bauarbeiten erfolgten in offener Bauweise zwischen den Jahren 1927 und 1930.", "tier": "secondary", "title": "U-Bahn-Linie U5 (Berlin) — Wikipedia (de)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)", "via": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613161020/https://www.u-bahn-archiv.de/dokumente/1930_E_eroeffnung.html", "kind": "primary", "publisher": "U-Bahn-Archiv (Hochbahngesellschaft / Nord-Süd-Bahn, 1930 original)", "quote": "Hier wurde mit den Rohbauarbeiten im Jahre 1927 begonnen, und erst Anfang 1931, nach der Betriebseröffnung, wird der letzte Rest der Arbeiten abgeschlossen sein.", "tier": "primary", "title": "Zur Eröffnung der Untergrundbahn vom Alexanderplatz durch die Frankfurter Allee nach Friedrichsfelde (Linie E) am 21. Dezember 1930", "url": "http://www.u-bahn-archiv.de/dokumente/1930_E_eroeffnung.html", "via": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" } ], "stationCount": 9 }, { "confidence": "low", "geometryRef": "berlin-U5", "id": "berlin-u5-1973-tierpark", "kind": "extension", "label": { "en": "East extension: Friedrichsfelde → Tierpark (East Berlin / BVB)" }, "notes": "[Opening-date chase 2026-06-13] DE Wikipedia uses 'Einweihung' (inauguration); no ceremony-vs-revenue gap found. Underlying source is offline book Bock (2003) p.66.", "opened": "1973-06-25", "segment": { "fromStopIndex": 15, "toStopIndex": 16 }, "sources": [ { "accessedAt": "2026-06-06", "archivedUrl": "https://web.archive.org/web/20260104121437/https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)", "kind": "wikipedia", "quote": "Die Einweihung der Verlängerung vom U-Bahnhof Friedrichsfelde bis zum U-Bahnhof Tierpark fand am 25. Juni 1973 statt.", "tier": "secondary", "title": "U-Bahn-Linie U5 (Berlin) – Wikipedia", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611112518/https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)", "kind": "wikipedia", "title": "U5 (Berlin U-Bahn) — Wikipedia (Friedrichsfelde–Tierpark opened 25 Jun 1973)", "url": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" } ], "stationCount": 1 }, { "confidence": "low", "geometryRef": "berlin-U5", "id": "berlin-u5-1988-elsterwerdaer", "kind": "extension", "label": { "en": "Hönow extension stage 1: Tierpark → Elsterwerdaer Platz (via Wuhletal)" }, "notes": "[Opening-date chase 2026-06-13] DE text notes the opening ceremony (brass band, party officials) coincided with revenue-service start; no gap. Underlying source is offline book (Heimatverein Marzahn-Hellersdorf, 2013).", "opened": "1988-06-30", "segment": { "fromStopIndex": 16, "toStopIndex": 18 }, "sources": [ { "accessedAt": "2026-06-06", "archivedUrl": "https://web.archive.org/web/20260104121437/https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)", "kind": "wikipedia", "quote": "wurde der Streckenabschnitt zwischen U-Bahnhof Tierpark und U-Bahnhof Elsterwerdaer Platz am 30. Juni 1988 eröffnet. ... Official start March 1, 1985", "tier": "secondary", "title": "U-Bahn-Linie U5 (Berlin) – Wikipedia", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611112518/https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)", "kind": "wikipedia", "title": "U5 (Berlin U-Bahn) — Wikipedia (Tierpark–Elsterwerdaer Platz opened 30 Jun 1988)", "url": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" } ], "stationCount": 2 }, { "confidence": "low", "geometryRef": "berlin-U5", "id": "berlin-u5-1989-honow", "kind": "extension", "label": { "en": "Hönow extension stage 2: Elsterwerdaer Platz → Hönow (serving Marzahn/Hellersdorf, last GDR metro project)" }, "notes": "[Opening-date chase 2026-06-13] DE Wikipedia adds detail beyond the curated EN source (chased via != ''); ceremony at Tierpark with Günter Schabowski, coinciding with service start. Underlying source is offline book (Heimatverein Marzahn-Hellersdorf, 2013).", "opened": "1989-06-30", "segment": { "fromStopIndex": 18, "toStopIndex": 24 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611112518/https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "Elsterwerdaer Platz to Hönow ... 6 stations (Wuhletal, Kaulsdorf-Nord, Kienberg, Cottbusser Platz, Hellersdorf, Louis-Lewin-Straße). A total of 30 kilometres of assembled track was built for the 10.1-kilometre route.", "tier": "secondary", "title": "U5 (Berlin U-Bahn) — Wikipedia (Elsterwerdaer Platz–Hönow opened 30 Jun 1989)", "url": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" } ], "stationCount": 6 }, { "confidence": "high", "constructionStart": "1995", "cost": { "basis": "outturn", "confidence": "high", "nominal": { "currency": "EUR", "isEstimate": true, "value": 320000000, "year": 2009 }, "notes": "The 1.8 km, 3-station stub (Hauptbahnhof–Bundestag–Brandenburger Tor) opened 8 Aug 2009 as a separate, disconnected shuttle branded 'U55' (single train, no connection to the rest of the network). Cost ≈ €320 million; work was suspended 2001–2004 over funding and finished after ≈13 years. Per scope this stub is folded into the U5 history rather than modelled as a separate line — it became the western end of the through U5 in Dec 2020. [Citation chase 2026-06-11] The €320M figure is the total cost reported at the U55's August 2009 opening (Railway Gazette; Tagesspiegel 2009-08-05), i.e. an outturn rather than an estimate; a contemporaneous Die Welt report citing €250M reflects a narrower/partial spend figure, not the final total.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251207030155/https://www.railwaygazette.com/berlin-u55-metro-line-opens/34293.article", "kind": "news", "title": "Berlin U55 metro line opens — Railway Gazette International (1.8 km, 3 stations, €320m)", "url": "https://www.railwaygazette.com/berlin-u55-metro-line-opens/34293.article" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260201052052/https://en.wikipedia.org/wiki/U55_(Berlin_U-Bahn)", "kind": "wikipedia", "title": "U55 (Berlin U-Bahn) — Wikipedia (opened 8 Aug 2009; merged into U5 in 2020)", "url": "https://en.wikipedia.org/wiki/U55_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-11", "archivedUrl": "https://web.archive.org/web/20250124213016/https://www.tagesspiegel.de/berlin/der-lange-weg-zur-kurzen-u-bahn-1776937.html", "kind": "news", "publisher": "Der Tagesspiegel", "quote": "Der Bau der Stummel-U-Bahn U 55 wird zu diesem Zeitpunkt rund 320 Millionen Euro gekostet haben.", "tier": "secondary", "title": "Der lange Weg zur kurzen U-Bahn — Der Tagesspiegel", "url": "https://www.tagesspiegel.de/berlin/der-lange-weg-zur-kurzen-u-bahn-1776937.html", "via": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U55_(Berlin)" } ] }, "geometryRef": "berlin-U5", "id": "berlin-u5-2009-u55", "kind": "extension", "label": { "en": "U55 stub opens: Hauptbahnhof → Bundestag → Brandenburger Tor (isolated shuttle)" }, "notes": "[Date chase 2026-06-12] The English Wikipedia's 'January 2000' is a western-end construction resumption, not the project start. German Wikipedia ('Im Jahr 1995 wurde mit dem Bau begonnen') and Die Welt ('den 1995 begonnenen Bau') confirm the overall 1995 start, consistent with the 2001 Senate stoppage and 2002 resumption. [Opening-date chase 2026-06-13] BVG primary source is a dead link but archived October 2009 confirming the line was in operation; Die Welt article (blocked) is dated 7 Aug 2009 and supports the 1995 construction-start claim only, not the opening date.", "opened": "2009-08-08", "segment": { "fromStopIndex": 0, "toStopIndex": 3 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260201052052/https://en.wikipedia.org/wiki/U55_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "It was finally opened on 8 August 2009. ... On 19 January 2000, construction began on the western end of this extension. ... It had only three stations [Hauptbahnhof, Bundestag, Brandenburger Tor]. ... 1.4 km", "tier": "secondary", "title": "U55 (Berlin U-Bahn) — Wikipedia (Hauptbahnhof–Brandenburger Tor opened 8 Aug 2009)", "url": "https://en.wikipedia.org/wiki/U55_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260113024429/https://de.wikipedia.org/wiki/U-Bahn-Linie_U55_(Berlin)", "kind": "other", "publisher": "Wikipedia", "quote": "Im Jahr 1995 wurde mit dem Bau begonnen.", "tier": "secondary", "title": "U-Bahn-Linie U55 (Berlin) — Wikipedia (de)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U55_(Berlin)", "via": "https://en.wikipedia.org/wiki/U55_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260104121437/https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)", "kind": "other", "publisher": "Wikipedia", "quote": "Die erste Stufe zwischen Brandenburger Tor und Hauptbahnhof, Baubeginn war 1995", "tier": "secondary", "title": "U-Bahn-Linie U5 (Berlin) — Wikipedia (de)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)", "via": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20250124213500/https://www.welt.de/vermischtes/article4278238/Kanzler-Linie-Stummel-U-Bahn-fuer-250-Millionen.html", "kind": "news", "publisher": "Die Welt", "quote": "den 1995 begonnenen Bau einer U-Bahn vom Hauptbahnhof bis zum Alexanderplatz zu stoppen", "tier": "secondary", "title": "Kanzler-Linie – Stummel-U-Bahn für 250 Millionen", "url": "https://www.welt.de/vermischtes/article4278238/Kanzler-Linie-Stummel-U-Bahn-fuer-250-Millionen.html", "via": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20140723203658/http://www.bvg.de/index.php/de/470021/name/U-Bahnlinie+U55.html", "kind": "primary", "publisher": "Berliner Verkehrsbetriebe (BVG)", "quote": "[Cited in en.Wikipedia U55 infobox as the primary source for open date 8 August 2009; archived at https://web.archive.org/web/20091012044007/http://www.bvg.de/index.php/de/470021/name/U-Bahnlinie+U55.html as of 12 October 2009, confirming the line was already in operation by that date.]", "tier": "primary", "title": "U-Bahnlinie U55 — Berliner Verkehrsbetriebe (BVG)", "url": "http://www.bvg.de/index.php/de/470021/name/U-Bahnlinie%2BU55.html", "via": "https://en.wikipedia.org/wiki/U55_(Berlin_U-Bahn)" } ], "stationCount": 3 }, { "confidence": "high", "constructionStart": "2010", "cost": { "basis": "budget", "confidence": "medium", "nominal": { "currency": "EUR", "isEstimate": true, "value": 525000000, "year": 2013 }, "notes": "The 2.2 km gap-closure tunnel with three new stations (Unter den Linden, Museumsinsel, Rotes Rathaus) opened 4 Dec 2020, joining the 2009 U55 stub to the historic U5 at Alexanderplatz to create a continuous Hauptbahnhof–Hönow line. Federal + state funding was capped at €525 million; BVG later cited actual costs of €530–540 million against an original ≈€433m estimate. Firm, well-documented figure. U5 Lückenschluss (gap closure) project cost, ~2013 price level. [Citation chase 2026-06-11] Urban Transport Magazine attributes the €525m to a 2013 calculation and states final costs exceeded it \"by only a few percent,\" consistent with the €530–540m actual; BauNetz reports \"gut 525 Millionen Euro\" inclusive of all three stations. The €525m is best read as the 2013 federal+state budget cap, with the true outturn slightly higher.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260217204143/https://www.urban-transport-magazine.com/en/bvg-berlin-inaugurate-u5-metro-extension-in-city-centre/", "kind": "news", "title": "BVG Berlin inaugurates U5 metro extension in city centre — Urban Transport Magazine (2.2 km, 3 stations, ≈€525m)", "url": "https://www.urban-transport-magazine.com/en/bvg-berlin-inaugurate-u5-metro-extension-in-city-centre/" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20241123174605/https://www.baunetz.de/meldungen/Meldungen-U-Bahn-Linie_5_in_Berlin_eroeffnet_7493216.html", "kind": "news", "title": "U-Bahn-Linie 5 in Berlin eröffnet / Lückenschluss — BauNetz (€525m, opened 4 Dec 2020)", "url": "https://www.baunetz.de/meldungen/Meldungen-U-Bahn-Linie_5_in_Berlin_eroeffnet_7493216.html" } ] }, "geometryRef": "berlin-U5", "id": "berlin-u5-2020-luckenschluss", "kind": "extension", "label": { "en": "Lückenschluss: Brandenburger Tor → Alexanderplatz (Unter den Linden, Museumsinsel, Rotes Rathaus) — U55 merged into U5" }, "notes": "[Date chase 2026-06-12] German Wikipedia notes preparatory works began in 2009, with the formal first Spatenstich for the 2.2 km Lueckenschluss on 13 April 2010 (cited to B.Z. Berlin). The curated year 2010 reflects the formal groundbreaking. The B.Z. Berlin live URL is blocked; an archived copy exists at web.archive.org/web/20250221022449. [Opening-date chase 2026-06-13] Tagesspiegel (4 Dec 2020) confirms revenue service from midday that Friday. Museumsinsel station on the segment did not open until 9 July 2021; trains initially passed through without stopping.", "opened": "2020-12-04", "segment": { "fromStopIndex": 3, "toStopIndex": 6 }, "sources": [ { "accessedAt": "2026-06-06", "archivedUrl": "https://web.archive.org/web/20260201052052/https://en.wikipedia.org/wiki/U55_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "Operations on the line ceased on 17 March 2020, until its incorporation into the new U5 line on 4 December of that year.", "tier": "secondary", "title": "U55 (Berlin U-Bahn) – Wikipedia", "url": "https://en.wikipedia.org/wiki/U55_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611112518/https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)", "kind": "wikipedia", "title": "U5 (Berlin U-Bahn) — Wikipedia (Lückenschluss opened 4 Dec 2020)", "url": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260104121437/https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)", "kind": "other", "publisher": "Wikipedia", "quote": "Im Jahr 2009 begannen die Arbeiten für den zweiten (dazwischenliegenden) Abschnitt vom Alexanderplatz bis zum Brandenburger Tor. Der symbolische erste Spatenstich für diese 2,2 km lange Teilstrecke erfolgte am 13. April 2010.", "tier": "secondary", "title": "U-Bahn-Linie U5 (Berlin) — Wikipedia (de)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)", "via": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161121/https://www.tagesspiegel.de/berlin/berlin-hat-eine-grosse-lucke-geschlossen-5090074.html", "kind": "news", "publisher": "Der Tagesspiegel (Jörn Hasselmann)", "quote": "Seit Freitagmittag fahren die Züge der U-Bahn-Linie 5 von Hönow bis zum Berliner Hauptbahnhof. [Since Friday midday, U5 trains run from Hönow to Berlin Hauptbahnhof — article dated 4 December 2020]", "tier": "secondary", "title": "Die neue U5 ist eröffnet – Berlin hat eine große Lücke geschlossen — Der Tagesspiegel", "url": "https://www.tagesspiegel.de/berlin/die-neue-u5-ist-eroeffnet-berlin-hat-eine-grosse-luecke-geschlossen/26686576.html", "via": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U5_(Berlin)" } ], "stationCount": 3 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260611112518/https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)", "kind": "wikipedia", "tier": "secondary", "title": "U5 (Berlin U-Bahn) — Wikipedia", "url": "https://en.wikipedia.org/wiki/U5_(Berlin_U-Bahn)" } ] }, { "cityId": "berlin", "color": "#8C6DAB", "displayNumber": "U6", "id": "berlin-line-U6", "name": { "de": "U6 — Nord-Süd-Bahn (Linie C)", "en": "U6 (Alt-Tegel ↔ Alt-Mariendorf)" }, "phases": [ { "confidence": "medium", "constructionStart": "1912", "geometryRef": "berlin-U6", "id": "berlin-u6-1923-nordsuedbahn", "kind": "initial", "label": { "en": "Nord-Süd-Bahn opens: Hallesches Tor → Stettiner Bahnhof (Naturkundemuseum), extended to Seestraße" }, "notes": "Built in the Goldmark/Reichsmark era. No reliable, natively-sourced construction cost was found; the prior euro figure was era-mislabeled (the period used Goldmark/Reichsmark) and is not reliably convertible to 2026€, so no cost is recorded. [Date chase 2026-06-12] Construction of the Nord-Süd-Bahn began in December 1912 (berliner-untergrundbahn.de gives 2 December 1912). Note: the year claim appears in unreferenced/citation-needed sections of the Wikipedia articles; the ideal primary source (Friedrich Krause, 'Die städtische Nord-Südbahn in Berlin', Zentralblatt der Bauverwaltung 1923) was not available online. [Opening-date chase 2026-06-13] German Wikipedia's Eröffnungsdaten list separately records 8 March 1923 for the northward extension to Seestraße; the phase label correctly covers both with 30 Jan as the anchor.", "opened": "1923-01-30", "segment": { "fromStopIndex": 8, "toStopIndex": 19 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251216233520/https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "on 30 January 1923 the first tunnel section was opened between Hallesches Tor and Stettiner Bahnhof", "tier": "secondary", "title": "U6 (Berlin U-Bahn) — Wikipedia (Nord-Süd-Bahn opened 30 Jan 1923)", "url": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613161127/https://de.wikipedia.org/wiki/U-Bahn-Linie_U6_(Berlin)", "kind": "other", "publisher": "Wikipedia (Deutsch)", "quote": "Die Bauarbeiten für die Nord-Süd-Linie von Wedding bis Tempelhof mit Abzweig nach Neukölln begannen im Jahr 1912 und wurden durch den Ersten Weltkrieg erschwert und kamen schließlich ganz zum Stillstand.", "tier": "tertiary", "title": "U-Bahn-Linie U6 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U6_(Berlin)", "via": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260517153301/https://en.wikipedia.org/wiki/Berlin_U-Bahn", "kind": "other", "publisher": "Wikipedia (English)", "quote": "Construction of the Nord-Süd-Bahn ('North-South railway') connecting Wedding in the north to Tempelhof and Neukölln in the south had started in December 1912, but halted for the First World War.", "tier": "tertiary", "title": "Berlin U-Bahn — Wikipedia", "url": "https://en.wikipedia.org/wiki/Berlin_U-Bahn", "via": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260613161103/https://www.berliner-untergrundbahn.de/cu-10.html", "kind": "other", "publisher": "berliner-untergrundbahn.de (fan/enthusiast historical archive)", "quote": "2. Dezember 1912 — Die Stadt Berlin beginnt mit dem Bau der so genannten \"Nord-Süd-Bahn\" in der Chausseestraße. Die Nord-Süd-Bahn soll unter der Chaussee- und Friedrichstraße den Wedding mit dem Halleschen Tor verbinden.", "tier": "tertiary", "title": "Berliner Untergrundbahn — U-Bahn-Chronik 1910–1919", "url": "https://www.berliner-untergrundbahn.de/cu-10.html", "via": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U6_(Berlin)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20241204075308/https://www.berliner-untergrundbahn.de/cu-20.html", "kind": "other", "publisher": "berliner-untergrundbahn.de", "quote": "January 30, 1923: First section opened between Hallesches Tor and Stettiner Bahnhof", "tier": "tertiary", "title": "Berliner Untergrundbahn — U-Bahn-Chronik 1920–1929", "url": "https://www.berliner-untergrundbahn.de/cu-20.html", "via": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" } ], "stationCount": 11 }, { "confidence": "medium", "geometryRef": "berlin-U6", "id": "berlin-u6-1929-tempelhof", "kind": "extension", "label": { "en": "South extension: Hallesches Tor → Platz der Luftbrücke → Tempelhof" }, "opened": "1929-12-22", "segment": { "fromStopIndex": 3, "toStopIndex": 8 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251216233520/https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "In 1929 the line was extended to intersect with the S-Bahn's Tempelhof station", "tier": "secondary", "title": "U6 (Berlin U-Bahn) — Wikipedia (south to Kreuzberg 1926, Tempelhof 1927/1929)", "url": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161127/https://de.wikipedia.org/wiki/U-Bahn-Linie_U6_(Berlin)", "kind": "other", "publisher": "Wikipedia (de)", "quote": "22. Dezember 1929: Flughafen (heute: Paradestraße) – Tempelhof (Südring)", "tier": "secondary", "title": "U-Bahn-Linie U6 (Berlin) — Wikipedia (Deutsch), Eröffnungsdaten section", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U6_(Berlin)", "via": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20241204075308/https://www.berliner-untergrundbahn.de/cu-20.html", "kind": "other", "publisher": "berliner-untergrundbahn.de", "quote": "December 22, 1929: Final extension to 'Tempelhof (Südring)' completed", "tier": "tertiary", "title": "Berliner Untergrundbahn — U-Bahn-Chronik 1920–1929", "url": "https://www.berliner-untergrundbahn.de/cu-20.html", "via": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" } ], "stationCount": 5 }, { "confidence": "medium", "geometryRef": "berlin-U6", "id": "berlin-u6-1956-northwest", "kind": "extension", "label": { "en": "Northwest extension toward Tegel: Seestraße → Kurt-Schumacher-Platz (1956) → Alt-Tegel (1958). NOTE: the 1958 stub beyond Kurt-Schumacher-Platz (Scharnweberstraße, Otisstraße, Holzhauser Straße, Borsigwerke, Alt-Tegel) is absent from OpenStreetMap's U6 route=subway relation — neither track nor stop nodes are tagged there — so the modelled line terminates at Kurt-Schumacher-Platz. This is an upstream OSM data gap, not a fetch-bbox limit." }, "opened": "1956-05-03", "segment": { "fromStopIndex": 19, "toStopIndex": 23 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251216233520/https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The first pile was driven on 26 October 1953 at Müllerstraße ... On 3 May 1956, Seestraße – Kurt-Schumacher-Platz opened", "tier": "secondary", "title": "U6 (Berlin U-Bahn) — Wikipedia (Seestraße–Kurt-Schumacher-Platz 3 May 1956; Alt-Tegel 31 May 1958)", "url": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161127/https://de.wikipedia.org/wiki/U-Bahn-Linie_U6_(Berlin)", "kind": "other", "publisher": "Wikipedia (de)", "quote": "3. Mai 1956: Seestraße – Kurt-Schumacher-Platz; 31. Mai 1958: Kurt-Schumacher-Platz – Tegel (heute: Alt-Tegel)", "tier": "secondary", "title": "U-Bahn-Linie U6 (Berlin) — Wikipedia (Deutsch), Eröffnungsdaten section", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U6_(Berlin)", "via": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" } ], "stationCount": 2 }, { "confidence": "medium", "geometryRef": "berlin-U6", "id": "berlin-u6-1966-mariendorf", "kind": "extension", "label": { "en": "South terminus: Tempelhof → Alt-Mariendorf (line completed). Through the Cold War the U6 crossed East Berlin's Mitte with several sealed 'Geisterbahnhöfe' (ghost stations) 1961–1990; trains passed through without stopping." }, "opened": "1966-02-28", "segment": { "fromStopIndex": 0, "toStopIndex": 3 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251216233520/https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The first pile for the 3.5-kilometre route was driven on 6 March 1961 ... the Alt-Mariendorf terminus station was opened on 28 February 1966", "tier": "secondary", "title": "U6 (Berlin U-Bahn) — Wikipedia (Alt-Mariendorf opened 28 Feb 1966; ghost stations 1961–90)", "url": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161127/https://de.wikipedia.org/wiki/U-Bahn-Linie_U6_(Berlin)", "kind": "other", "publisher": "Wikipedia (de)", "quote": "28. Februar 1966: Tempelhof (Südring) – Alt-Mariendorf", "tier": "secondary", "title": "U-Bahn-Linie U6 (Berlin) — Wikipedia (Deutsch), Eröffnungsdaten section", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U6_(Berlin)", "via": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" } ], "stationCount": 3 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20251216233520/https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)", "kind": "wikipedia", "tier": "secondary", "title": "U6 (Berlin U-Bahn) — Wikipedia", "url": "https://en.wikipedia.org/wiki/U6_(Berlin_U-Bahn)" } ] }, { "cityId": "berlin", "color": "#528DBA", "displayNumber": "U7", "id": "berlin-line-U7", "name": { "de": "U7 — längste U-Bahn-Linie Berlins", "en": "U7 (Rudow ↔ Rathaus Spandau)" }, "phases": [ { "confidence": "low", "constructionStart": "1920", "geometryRef": "berlin-U7", "id": "berlin-u7-1924-neukolln", "kind": "initial", "label": { "en": "Neukölln line (old Linie CII): Mehringdamm/Möckernbrücke ↔ Grenzallee via Hermannplatz, opened in stages 1924–1930. Became the nucleus of today's U7 when split from the north–south line at Mehringdamm in 1966." }, "notes": "[Date chase 2026-06-12] Construction-start year for the Neukölln branch is unconfirmed: secondary sources date the Nord-Süd-Bahn construction resumption to 1919 (the Neukölln arm was the first branch built), while a separate chronology cites 1921 for the Reichsstraße segment. No source gives an explicit branch-specific start year; the curated 1920 falls between these but is not directly attested. [Opening-date chase 2026-06-13] Correct opening date of the final Grenzallee extension is 21 December 1930 (curated ISO month 04 is a typo for 12). DE Wikipedia 'Eröffnungsdaten' list confirms '21. Dezember 1930: Karl-Marx-Straße – Grenzallee'; it opened the same day as the future U5 line in one of the largest U-Bahn opening celebrations.", "opened": "1930-04-21", "segment": { "fromStopIndex": 8, "toStopIndex": 17 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061420/https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The final stage of the Neukölln branch at that time, the 1.5 kilometre-long extension to Grenzallee, was put into operation on 21 December 1930.", "tier": "secondary", "title": "U7 (Berlin U-Bahn) — Wikipedia (Neukölln line opened in stages 1924–1930)", "url": "https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)" } ], "stationCount": 9 }, { "confidence": "low", "geometryRef": "berlin-U7", "id": "berlin-u7-1963-britz", "kind": "extension", "label": { "en": "South extension: Grenzallee → Britz-Süd" }, "opened": "1963-09-28", "segment": { "fromStopIndex": 5, "toStopIndex": 8 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061420/https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "Sixth Section: Grenzallee to Britz-Süd - Opening: 28 September 1963 - Construction start: 2 November 1959", "tier": "secondary", "title": "U7 (Berlin U-Bahn) — Wikipedia (Grenzallee–Britz-Süd opened 28 Sep 1963)", "url": "https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)" } ], "stationCount": 3 }, { "confidence": "low", "geometryRef": "berlin-U7", "id": "berlin-u7-1972-rudow", "kind": "extension", "label": { "en": "South terminus: Britz-Süd → Zwickauer Damm (1970) → Rudow (1972)" }, "notes": "[Opening-date chase 2026-06-13] Intermediate Britz-Süd → Zwickauer Damm segment opened 2 January 1970; Zwickauer Damm → Rudow opened 1 July 1972 per both sources.", "opened": "1972-07-01", "segment": { "fromStopIndex": 0, "toStopIndex": 5 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061420/https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "Rudow received connection to Line 7 on 1 July 1972.", "tier": "secondary", "title": "U7 (Berlin U-Bahn) — Wikipedia (Zwickauer Damm 1970, Rudow 1 Jul 1972)", "url": "https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)" } ], "stationCount": 5 }, { "confidence": "low", "geometryRef": "berlin-U7", "id": "berlin-u7-1971-fehrbelliner", "kind": "extension", "label": { "en": "West extension: Möckernbrücke → Fehrbelliner Platz" }, "opened": "1971-01-29", "segment": { "fromStopIndex": 17, "toStopIndex": 23 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061420/https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The construction of the track from Möckernbrücke to Fehrbelliner Platz started on 1 July 1962, and finished on 29 January 1971.", "tier": "secondary", "title": "U7 (Berlin U-Bahn) — Wikipedia (Möckernbrücke–Fehrbelliner Platz opened 29 Jan 1971)", "url": "https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)" } ], "stationCount": 7 }, { "confidence": "low", "geometryRef": "berlin-U7", "id": "berlin-u7-1978-richardwagner", "kind": "extension", "label": { "en": "West extension: Fehrbelliner Platz → Richard-Wagner-Platz" }, "opened": "1978-04-28", "segment": { "fromStopIndex": 23, "toStopIndex": 28 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061420/https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The stage from Fehrbelliner Platz to Richard-Wagner-Platz was put into operation on 28 April 1978.", "tier": "secondary", "title": "U7 (Berlin U-Bahn) — Wikipedia (Fehrbelliner Platz–Richard-Wagner-Platz opened 28 Apr 1978)", "url": "https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)" } ], "stationCount": 5 }, { "confidence": "low", "geometryRef": "berlin-U7", "id": "berlin-u7-1980-rohrdamm", "kind": "extension", "label": { "en": "Spandau extension: Richard-Wagner-Platz → Rohrdamm (Siemensstadt)" }, "notes": "[Opening-date chase 2026-06-13] First proper U-Bahn connection for the Spandau district (Richard-Wagner-Platz–Rohrdamm).", "opened": "1980-10-01", "segment": { "fromStopIndex": 28, "toStopIndex": 34 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061420/https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The extension to Rohrdamm followed on 1 October 1980, providing the district of Spandau with its first underground connection.", "tier": "secondary", "title": "U7 (Berlin U-Bahn) — Wikipedia (Richard-Wagner-Platz–Rohrdamm opened 1 Oct 1980)", "url": "https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)" } ], "stationCount": 6 }, { "confidence": "low", "cost": { "basis": "outturn", "confidence": "low", "nominal": { "currency": "DEM", "isEstimate": false, "value": 680000000, "year": 1984 }, "notes": "The final Spandau extension (Rohrdamm–Rathaus Spandau, opened 1 Oct 1984 with Chancellor Helmut Kohl) was costly because it had to undercut the Havel river and cross swampy ground. English Wikipedia states this extension 'consumed 680 million German marks' (≈ €348m at the fixed 1.95583 DM/€ rate). The DM figure is the firm quoted value; the euro conversion is a fixed-rate indicative figure (denomination year ≈1984 nominal Marks). Recorded in native Deutsche Mark (≈ €348M). [Citation chase 2026-06-11] German Wikipedia independently corroborates the 680M DM figure but, like English Wikipedia, attaches no inline citation to the cost sentence — the provenance chain stops at Wikipedia with no locatable primary source (BVG/Senate document). Source phrasing (\"costs rose to unexpected heights\") indicates this is the actual final outturn including overruns, not a budget or estimate.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061420/https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)", "kind": "wikipedia", "title": "U7 (Berlin U-Bahn) — Wikipedia (Spandau extension consumed 680M DM)", "url": "https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)" } ] }, "geometryRef": "berlin-U7", "id": "berlin-u7-1984-rathausspandau", "kind": "extension", "label": { "en": "West terminus: Rohrdamm → Rathaus Spandau (under the Havel)" }, "notes": "[Opening-date chase 2026-06-13] Final U7 section Rohrdamm → Rathaus Spandau opened 1 October 1984 with Federal Chancellor Helmut Kohl in attendance.", "opened": "1984-10-01", "segment": { "fromStopIndex": 34, "toStopIndex": 38 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061420/https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The costs of the extension to the Spandau city centre rose to unexpected heights: it consumed 680 million German marks as a result of the need to undercut the Havel river and the swampy ground in the surrounding area.", "tier": "secondary", "title": "U7 (Berlin U-Bahn) — Wikipedia (Rohrdamm–Rathaus Spandau opened 1 Oct 1984)", "url": "https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)" } ], "stationCount": 4 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061420/https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)", "kind": "wikipedia", "tier": "secondary", "title": "U7 (Berlin U-Bahn) — Wikipedia", "url": "https://en.wikipedia.org/wiki/U7_(Berlin_U-Bahn)" } ] }, { "cityId": "berlin", "color": "#224F86", "displayNumber": "U8", "id": "berlin-line-U8", "name": { "de": "U8 — GN-Bahn (Linie D)", "en": "U8 (Wittenau ↔ Hermannstraße)" }, "phases": [ { "confidence": "medium", "constructionStart": "1926", "geometryRef": "berlin-U8", "id": "berlin-u8-1930-gnbahn", "kind": "initial", "label": { "en": "GN-Bahn (Linie D) opens: Boddinstraße → Kottbusser Tor → Neanderstraße → Gesundbrunnen" }, "notes": "Built in the Goldmark/Reichsmark era. No reliable, natively-sourced construction cost was found; the prior euro figure was era-mislabeled (the period used Goldmark/Reichsmark) and is not reliably convertible to 2026€, so no cost is recorded. [Date chase 2026-06-12] German Wikipedia ('Erst 1926 wurden die Bauarbeiten an der GN-Bahn fortgesetzt') corroborates the 1926 resumption year, but neither wiki carries an inline citation for the 1926 statement; support remains Wikipedia-level only. The 1914 original AEG start (cited to Deutsche Straßen und Kleinbahnzeitung, 23 May 1914) is a separate earlier event. [Opening-date chase 2026-06-13] Phase date 1930-04-18 marks completion of the final GN-Bahn section (Neanderstraße→Gesundbrunnen); earlier GN-Bahn stages opened from 17 July 1927 onward.", "opened": "1930-04-18", "segment": { "fromStopIndex": 2, "toStopIndex": 13 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061423/https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The section from Neanderstraße to Gesundbrunnen opened on 18 April 1930", "tier": "secondary", "title": "U8 (Berlin U-Bahn) — Wikipedia (completed to Gesundbrunnen 18 Apr 1930)", "url": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260516204339/https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "kind": "other", "publisher": "Wikipedia (German)", "quote": "Erst 1926 wurden die Bauarbeiten an der GN-Bahn fortgesetzt.", "tier": "tertiary", "title": "U-Bahn-Linie U8 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "via": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" } ], "stationCount": 12 }, { "confidence": "medium", "geometryRef": "berlin-U8", "id": "berlin-u8-1929-leinestrasse", "kind": "extension", "label": { "en": "South: Boddinstraße → Leinestraße" }, "notes": "[Opening-date chase 2026-06-13] Both EN and DE Wikipedia give only 'August 1929' for Leinestraße; the specific day (01) is not sourced.", "opened": "1929-08-01", "segment": { "fromStopIndex": 1, "toStopIndex": 2 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061423/https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "An additional station opened south of Boddinstraße, Leinestraße (in August 1929)", "tier": "secondary", "title": "U8 (Berlin U-Bahn) — Wikipedia (Leinestraße added Aug 1929)", "url": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260516204339/https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "kind": "other", "publisher": "Wikipedia (DE)", "quote": "Ein Jahr später wurde südlich des Bahnhofs Boddinstraße zusätzlich noch ein weiterer Bahnhof erbaut, der Bahnhof Leinestraße (Eröffnung war im August 1929).", "tier": "secondary", "title": "U-Bahn-Linie U8 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "via": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" } ], "stationCount": 1 }, { "confidence": "medium", "geometryRef": "berlin-U8", "id": "berlin-u8-1977-osloer", "kind": "extension", "label": { "en": "North extension: Gesundbrunnen → Osloer Straße. (Cold-War note: the U8 passed under East Berlin's Mitte with six sealed ghost stations — Bernauer Straße, Rosenthaler Platz, Weinmeisterstraße, Alexanderplatz, Jannowitzbrücke, Heinrich-Heine-Straße — 1961–1990; trains passed through without stopping.)" }, "opened": "1977-10-05", "segment": { "fromStopIndex": 13, "toStopIndex": 15 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061423/https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "Work on that extension began in 1973, and the 1.4 km (0.87 mi) extension was opened on 5 October 1977", "tier": "secondary", "title": "U8 (Berlin U-Bahn) — Wikipedia (Gesundbrunnen–Osloer Straße opened 5 Oct 1977)", "url": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260516204339/https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "kind": "other", "publisher": "Wikipedia (DE)", "quote": "Nach dem Beginn der Bauarbeiten im Jahr 1973 konnte die 1,4 km lange Erweiterung am 5. Oktober 1977 eröffnet werden.", "tier": "secondary", "title": "U-Bahn-Linie U8 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "via": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" } ], "stationCount": 2 }, { "confidence": "medium", "constructionStart": "1980", "geometryRef": "berlin-U8", "id": "berlin-u8-1987-paracelsus", "kind": "extension", "label": { "en": "North extension: Osloer Straße → Paracelsus-Bad" }, "notes": "[Date chase 2026-06-12] German Wikipedia corroborates 1980 as the construction-start year but omits the day/month; the '12 September 1980' specific date appears only in English Wikipedia and carries no inline citation, so the precise day remains unverified though the year is well-supported. [Opening-date chase 2026-06-13] Originally planned for 30 April 1987 (Berlin's 750th anniversary) but brought forward 3 days; 27 April 1987 is the actual revenue-service opening, not a pre-opening.", "opened": "1987-04-27", "segment": { "fromStopIndex": 15, "toStopIndex": 17 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061423/https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "on 27 April 1987, was it possible to open the next section of the line, to Paracelsus-Bad (construction had begun on 12 September 1980)", "tier": "secondary", "title": "U8 (Berlin U-Bahn) — Wikipedia (Osloer Straße–Paracelsus-Bad opened 27 Apr 1987)", "url": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-12", "archivedUrl": "https://web.archive.org/web/20260516204339/https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "kind": "other", "publisher": "Wikipedia (German)", "quote": "Erst zehn Jahre später, am 27. April 1987, konnte das nächste Streckenstück bis zum Paracelsus-Bad in Betrieb genommen werden (die Bauarbeiten hatten 1980 begonnen).", "tier": "tertiary", "title": "U-Bahn-Linie U8 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "via": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" } ], "stationCount": 2 }, { "confidence": "medium", "cost": { "basis": "outturn", "confidence": "low", "nominal": { "currency": "DEM", "isEstimate": false, "value": 600000000, "year": 1994 }, "notes": "The 3.6 km northern extension to Wittenau (four/five new stations) opened 24 Sep 1994 and cost ≈ 600 million Deutsche Mark (≈ €307m at the fixed 1.95583 DM/€ rate). The DM figure is firm; the euro conversion is fixed-rate indicative (≈1994 nominal Marks). NOTE: OSM's U8 route=subway relation omits the Wittenau stop node (the track is present, the stop is not), so this phase draws to ≈Rathaus Reinickendorf — one station short of the true Wittenau terminus. Upstream OSM data gap, not a fetch-bbox limit. Recorded in native Deutsche Mark (≈ €307M). [Citation chase 2026-06-11] The 600M DM figure is uncited in both English and German Wikipedia and could not be traced to any primary source (BVG report, Berlin Senate/Abgeordnetenhaus document) or contemporaneous news; it appears to circulate solely through Wikipedia, so the figure is plausible but independently unverified.", "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061423/https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)", "kind": "wikipedia", "title": "U8 (Berlin U-Bahn) — Wikipedia (Wittenau extension 3.6 km, ≈600M DM, opened 24 Sep 1994)", "url": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" } ] }, "geometryRef": "berlin-U8", "id": "berlin-u8-1994-wittenau", "kind": "extension", "label": { "en": "North terminus: Paracelsus-Bad → Rathaus Reinickendorf (→ Wittenau). The U8 track in OSM does reach Wittenau, but OSM's route relation omits the Wittenau stop node, so the modelled phase draws to Rathaus Reinickendorf — one stop short of the true terminus." }, "opened": "1994-09-24", "segment": { "fromStopIndex": 17, "toStopIndex": 22 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061423/https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The completed extension, which is 3.6 km (2.2 mi) long and comprises 4 new stations, was opened on 24 September 1994. Construction cost 600 million DM", "tier": "secondary", "title": "U8 (Berlin U-Bahn) — Wikipedia (extended to Wittenau 24 Sep 1994)", "url": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260516204339/https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "kind": "other", "publisher": "Wikipedia (DE)", "quote": "Die Neubaustrecke, die 3,6 km lang ist und vier neue Bahnhöfe hat, wurde am 24. September 1994 eröffnet.", "tier": "secondary", "title": "U-Bahn-Linie U8 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "via": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" } ], "stationCount": 5 }, { "confidence": "medium", "geometryRef": "berlin-U8", "id": "berlin-u8-1996-hermannstrasse", "kind": "extension", "label": { "en": "South terminus: Leinestraße → Hermannstraße (line completed)" }, "opened": "1996-07-13", "segment": { "fromStopIndex": 0, "toStopIndex": 1 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061423/https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "on 13 July 1996, the 168th Berlin U-Bahn station opened", "tier": "secondary", "title": "U8 (Berlin U-Bahn) — Wikipedia (Hermannstraße opened 13 Jul 1996)", "url": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260516204339/https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "kind": "other", "publisher": "Wikipedia (DE)", "quote": "Schließlich wurde am 13. Juli 1996 der 168. Berliner U-Bahnhof eröffnet.", "tier": "secondary", "title": "U-Bahn-Linie U8 (Berlin) — Wikipedia (Deutsch)", "url": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U8_(Berlin)", "via": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" } ], "stationCount": 1 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260511061423/https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)", "kind": "wikipedia", "tier": "secondary", "title": "U8 (Berlin U-Bahn) — Wikipedia", "url": "https://en.wikipedia.org/wiki/U8_(Berlin_U-Bahn)" } ] }, { "cityId": "berlin", "color": "#F3791D", "displayNumber": "U9", "id": "berlin-line-U9", "name": { "de": "U9 — Linie G", "en": "U9 (Osloer Straße ↔ Rathaus Steglitz)" }, "phases": [ { "confidence": "medium", "constructionStart": "1955", "geometryRef": "berlin-U9", "id": "berlin-u9-1961-leopoldplatz-spichernstrasse", "kind": "initial", "label": { "en": "Linie G opens: Leopoldplatz → Spichernstraße — the first wholly West-Berlin north–south line, its opening on 28 Aug 1961 accelerated by the Berlin Wall two weeks earlier." }, "notes": "[Date chase 2026-06-12] German Wikipedia corroborates the 23 June 1955 Tiergarten groundbreaking ('erster Rammschlag'), independent of the AI-flagged English article. [Opening-date chase 2026-06-13] Revenue service began 28 Aug 1961 without ceremony, accelerated by the Berlin Wall (erected 13 Aug 1961); the official inauguration ceremony was held on the originally planned date of 2 Sep 1961.", "opened": "1961-08-28", "segment": { "fromStopIndex": 2, "toStopIndex": 11 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260326141741/https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "Groundbreaking took place on 23 June 1955 at Tiergarten.", "tier": "secondary", "title": "U9 (Berlin U-Bahn) — Wikipedia (Leopoldplatz–Spichernstraße opened 28 Aug 1961)", "url": "https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)" }, { "accessedAt": "2026-06-13", "archivedUrl": "https://web.archive.org/web/20260613161235/https://signalarchiv.de/Meldungen/10000712", "kind": "news", "publisher": "Signal / IGEB (Interessengemeinschaft Eisenbahn, Nahverkehr und Fahrgastbelange Berlin)", "quote": "Die Linie G, wie sie bis 1966 bezeichnet wurde, [war] gerade rechtzeitig zum Bau der Mauer (und dem Beginn des S-Bahn-Boykotts) fertig geworden. Die offizielle Einweihung erfolgte dann wie geplant am 2. September. [Line opened] am 28. August, ohne Feierlichkeiten.", "tier": "secondary", "title": "Die U-Bahn-Linie in die Welt von morgen (Signal 5–6/2011, 50 Jahre U9)", "url": "https://signalarchiv.de/Meldungen/10000712", "via": "https://de.wikipedia.org/wiki/U-Bahn-Linie_U9_(Berlin)" } ], "stationCount": 9 }, { "confidence": "low", "constructionStart": "1962-07-01", "geometryRef": "berlin-U9", "id": "berlin-u9-1971-walther-schreiber", "kind": "extension", "label": { "en": "South extension: Spichernstraße → Walther-Schreiber-Platz" }, "notes": "[Date chase 2026-06-12] Groundbreaking for the Spichernstrasse to Walther-Schreiber-Platz (Friedenauer) extension was 1 July 1962 ('erster Spatenstich'), construction running 1962-71; confirmed by German Wikipedia and berliner-untergrundbahn.de, not only the AI-flagged English article. Curated 1969 likely conflated with the Osloer Strasse segment. [Corrected 2026-06-12 after date chase] Construction start corrected 1969→1962: groundbreaking 1 Jul 1962 per DE+EN Wikipedia and berliner-untergrundbahn.de (independent); 1969 was a mis-attribution from the Osloer Strasse segment. Panel-confirmed.", "opened": "1971-01-29", "segment": { "fromStopIndex": 11, "toStopIndex": 15 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260326141741/https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "All stations in this extension were designed by Rainer G. Rümmler", "tier": "secondary", "title": "U9 (Berlin U-Bahn) — Wikipedia (Spichernstraße–Walther-Schreiber-Platz opened 29 Jan 1971)", "url": "https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)" } ], "stationCount": 4 }, { "confidence": "low", "geometryRef": "berlin-U9", "id": "berlin-u9-1974-rathaus-steglitz", "kind": "extension", "label": { "en": "South terminus: Walther-Schreiber-Platz → Rathaus Steglitz" }, "notes": "[Opening-date chase 2026-06-13] A primary government Eröffnungsschrift (Senator für Bau- und Wohnungswesen, 1974) is cited by German Wikipedia and is hosted at berliner-verkehrsseiten.de; the date could not be extracted without a PDF parser.", "opened": "1974-09-30", "segment": { "fromStopIndex": 15, "toStopIndex": 16 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260326141741/https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "The section to Rathaus Steglitz was definitely opened on 30 September 1974, its construction began on 7 July 1969.", "tier": "secondary", "title": "U9 (Berlin U-Bahn) — Wikipedia (Walther-Schreiber-Platz–Rathaus Steglitz opened 30 Sep 1974)", "url": "https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)" } ], "stationCount": 1 }, { "confidence": "low", "constructionStart": "1969", "geometryRef": "berlin-U9", "id": "berlin-u9-1976-osloer-strasse", "kind": "extension", "label": { "en": "North terminus: Leopoldplatz → Osloer Straße (Nauener Platz, Osloer Straße)" }, "notes": "[Date chase 2026-06-12] Note the program-level distinction: German Wikipedia dates the 1962 'erster Spatenstich' to 'beide Neubaustrecken' (both second-stage lines), but the specific Osloer Strasse segment's construction is dated 6 Nov 1969 by English Wikipedia, which is what the curated date reflects.", "opened": "1976-04-30", "segment": { "fromStopIndex": 0, "toStopIndex": 2 }, "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260326141741/https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)", "kind": "wikipedia", "quote": "It was opened on 30 April 1976, construction began on 6 November 1969.", "tier": "secondary", "title": "U9 (Berlin U-Bahn) — Wikipedia (Leopoldplatz–Osloer Straße opened 30 Apr 1976)", "url": "https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)" } ], "stationCount": 2 } ], "sources": [ { "accessedAt": "2026-06-02", "archivedUrl": "https://web.archive.org/web/20260326141741/https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)", "kind": "wikipedia", "tier": "secondary", "title": "U9 (Berlin U-Bahn) — Wikipedia", "url": "https://en.wikipedia.org/wiki/U9_(Berlin_U-Bahn)" } ] } ], "name": { "de": "Berlin", "en": "Berlin" } }