U6 (Berlin U-Bahn)

	Friedrichstraße, one of the stations on the U6
Overview
Locale	Berlin
Termini	Alt-Tegel; Alt-Mariendorf;
Stations	29
Service
Type	Rapid transit
System	Berlin U-Bahn
Operator(s)	Berliner Verkehrsbetriebe
Depot(s)	Britz; Seestraße;
Rolling stock	F84/87/90/92; H;
History
Opened	30 January 1923
Last extension	28 February 1966
Technical
Line length	19.9 km (12.4 mi)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Loading gauge	Großprofil
Electrification	750 V DC third rail (bottom running)
Route map
	Legend
	(closed 2020)
	(*) Under reconstruction until 2025
	This diagram: view; talk; edit;

U6 is a 19.9 km (12.4 mi) long rapid transit line on the Berlin U-Bahn with 29 stations. It runs in a north-south direction from the Berlin locality of Tegel in the north via Friedrichstraße to Mariendorf, a locality in the southern part of the city. It is one of the five large profile ("Großprofil") lines.^[3]

During the Cold War, both U6 termini were in the former West Berlin but the line passed under East Berlin for a short section of its route. Five of its stations were sealed off by East German authorities and the trains went through these so-called “ghost stations” without stopping, while a sixth, Friedrichstraße, remained open primarily as a transfer station between the U6 and the S-Bahn lines using the north-south S-Bahn tunnel, but also as an official border crossing between East and West Berlin.

It was formerly named "C^I" from 1923 to 1928.

^ "Einsatz Fahrzeugtypen U-Bahn". Berliner Linienchronik (in German). Berlin: Fabian Sawall. 1 January 2023. Archived from the original (PDF) on 11 June 2023. Retrieved 11 June 2023.
^ "Berlin Subway • Trackmap" (PDF). Gleisplanweb.de (in German and English). Kranenburg: Christian Stade. 11 December 2022. Archived from the original (PDF) on 7 April 2023. Retrieved 11 June 2023.
^ For historical reasons, the Berlin U-Bahn has cars of two different widths (designated small profile and large profile) despite their common track gauge (similar to the A and B Divisions of the New York City Subway). This necessitates independent operation of the lines on which they travel and a separate servicing infrastructure because of the different tunnel diameters and power supply systems. The narrower cars were built until 1930.

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[stock-1] "Einsatz Fahrzeugtypen U-Bahn". Berliner Linienchronik (in German). Berlin: Fabian Sawall. 1 January 2023. Archived from the original (PDF) on 11 June 2023. Retrieved 11 June 2023.

[trackmap-4] "Berlin Subway • Trackmap" (PDF). Gleisplanweb.de (in German and English). Kranenburg: Christian Stade. 11 December 2022. Archived from the original (PDF) on 7 April 2023. Retrieved 11 June 2023.

[6] For historical reasons, the Berlin U-Bahn has cars of two different widths (designated small profile and large profile) despite their common track gauge (similar to the A and B Divisions of the New York City Subway). This necessitates independent operation of the lines on which they travel and a separate servicing infrastructure because of the different tunnel diameters and power supply systems. The narrower cars were built until 1930.

[1]

[a]

[b]

[2]

[c]

[3]