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Unfinished platform for the proposed U10, atInnsbrucker Platz
Overview
Status	Unbuilt
Locale	Berlin
Termini	Weißensee Drakestraße
Stations	29
Service
Type	Rapid transit
System	Berlin U-Bahn
Operator(s)	Berliner Verkehrsbetriebe
Depot(s)	Weißensee[1]
Technical
Track gauge	1,435 mm (4 ft 8+1⁄2 in)standard gauge
Loading gauge	Großprofil
Route map Legend Reversing point Falkenberg Hohenschönhausen Zingster Straße Ribnitzer Straße Weißensee Depot Weißensee Falkenberger Straße Gürtelstraße Greifswalder Straße Danziger Straße[a] Marienburger Straße Am Friedrichshain Alexanderplatz    Rotes Rathaus[b] Spree Spreekanal Dönhoffplatz Stadtmitte[c]   Potsdamer Platz Kulturforum[d] Landwehr Canal Lützowstraße Kurfürstenstraße   Pallasstraße Kleistpark Kaiser-Wilhelm-Platz Dominicusstraße Innsbrucker Platz Rathaus Friedenau Kaisereiche Walther-Schreiber-Platz Schloßstraße Rathaus Steglitz Händelplatz Klinikum Tietzenweg Drakestraße Reversing point This diagram: view talk edit

The unbuiltU10 line, of theBerlin U-Bahn, was part of a planned "200-km-plan" extension of the Berlin U-Bahn from 1953–55, which was scrapped in 1977. It would have been a large-profile (Großprofil) metro line running fromFalkenberg, in the northeastern part of the city, toAlexanderplatz, and down toSteglitz before terminating at Drakestraße inLichterfelde. The designated letter name of the line was "F" until 1 July 1972, when it was changed to "Line 10". Because a number of tunnels and stations were constructed to accommodate the proposed line with elements visible at transfer stations and elsewhere, the line is popularly known as the "Phantomlinie" (Phantom line).

Prior todie Wende, the U10 line was in some other proposals intended to run from Drakestraße to theKulturforum and then via theBrandenburg Gate/Reichstag to Lehrter Stadtbahnhof (nowBerlin Hauptbahnhof), and from there continue alongLehrter Straße to the vicinity of theSchering AG headquarters inWedding.

Around 1993–96, afterreunification, the original 1950s plans for the U10 were discarded in favour of a provisional line U3/U35 (not to be confused with the currentU3). The north-eastern branch of the U3 line betweenWeißensee and Potsdamer Platz follow the path of the proposed U10 line, but U3 then crosses the Madgeburger Platz toWittenbergplatz and follows the path of the existing U1 line to Uhlandstraße, necessitating the need for conversion fromKleinprofil toGroßprofil. Plans for the southwestern section of U10 were abandoned for this routing because it ran parallel to the S-Bahn line S1 and was perceived as being redundant, although the economic impact of said redundancy has never been studied.

Planning for U10 was officially removed from the Berlin transport master plan in 2003 (Measures 2015), and it is no longer considered part of said public transport network master plan through at least 2030. The aforementioned revised U10 alignment (shown in the attached map as a dark turquoise dashed line from Weißensee toAdenauerplatz) nevertheless remainslegally safeguarded as part of Berlin'sLand-use plan since 1994, which means that construction along the proposed route must accommodate the eventuality of such a line. For example, theRotes Rathaus station on theU5 line extension (which opened in December 2020) includes a lower tunnel and shell station (Rohbau) for the proposed U10.

In 2023,Manja Schreiner [de], aCDU politician serving as Berlin's Transport Minister, proposed a new U10 alignment running from Alexanderplatz toBuch viaWeissensee, partly also to relieve the overcrowded M4 tram line.^[3]

Station	Short Form	Notes	Interchange
Falkenberg
Hohenschönhausen
Zingster Straße
Ribnitzer Straße
Weißensee
Falkenberger Straße
Gürtelstraße
Greifswalder Straße			(Ringbahn)
Danziger Straße
Marienburger Straße
Am Friedrichshain
Alexanderplatz	Al		(Stadtbahn)
Rotes Rathaus (unten)	RHU
Dönhoffplatz
Leipziger Straße			(Stadtmitte)
Potsdamer Platz	PP	Rohbau	(Nord-Süd-Tunnel)
Kulturforum
Lützowstraße
Kurfürstenstraße (unten)
Pallasstraße
Kleistpark	Ktu	Rohbau
Kaiser-Wilhelm-Platz
Dominicusstraße
Innsbrucker Platz	Ipu	Rohbau	(Ringbahn)
Rathaus Friedenau
Kaisereiche
Walther-Schreiber-Platz (Line F)	Wsf
Schloßstraße	Slo/Slu
Rathaus Steglitz	Rzu		(Wannseebahn)
Händelplatz
Klinikum Steglitz
Tietzenweg
Drakestraße

• AtAlexanderplatz station on the U5, two outer platforms were constructed to allow same-platform transfers. Today, these tracks are used for parking trains and for special service such as the Tunnel Tour. When the station was redesigned in the 1960s, the two-tunnel chamber toward Weissensee added a shielded chambers in accommodate two single-track tunnel boring machines.
• The station at Berlin-Rathaus on the U5 extension, opened in 2020 includes a lower level designed to accommodate a transfer to line U10.
• During the renovation ofMühlendamm Bridge in 1936, a 95-metre tunnel section was constructed below the Spree river bed. After the reunification of Berlin, the plans for using this tunnel were abandoned because of the development ofFischerinsel, and the tunnel was filled up in 1997.
• The 2006 renovation of the station atPotsdamer Platz includes a platform for line U10, and the station includes overpasses and underpasses to provide connections. The station includes a 392 m long tunnel for the U3/U10 line which is occasionally used for events.
• The 1967–69 construction of the U7 station atKleistpark includes a 90-m long section for a lower U10 platform and staircase connections to this platform.
• During the construction of the semi-ring of theBundesautobahn 100 in 1971–79, a platform for a U10 stop was erected under the freeway to allow connection to the U4 and S-bahn atInnsbrucker Platz.
• During construction of the extension of the U9 line from Walther-Schreiber-Platz to Steglitz in 1968–74, a building to house switching equipment was constructed, and the space beneath Schoßstrasse included a two-storey tunnel. The U9 line was never completed as envisioned, so the U9 line uses 1536 metres of tunnel built for the unfinished U10 as a reversing facility and to also store trains overnight.

• The information in this article is based on that in itsGerman equivalent.

• Der 200-KM-Plan

• Berlin U-Bahn lines

• CS1 German-language sources (de)
• Articles with short description
• Short description matches Wikidata
• Articles needing additional references from June 2023
• All articles needing additional references
• Articles containing German-language text