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The unbuilt U10 line of the Berlin U-Bahn was part of the "200-km-plan" of 1953-55 (through 1977) and would have been a driverless train line using CBTC from Falkenberg across the city to Alexanderplatz up to Steglitz and terminating at Drakestraße in Lichterfelde. The designated letter name of the line was "F." 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).
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Overview
After 1993, the plans for U10 were discarded in favor of a provisional line U3 (not to be confused with the current U3). The north-eastern branch of the U3 line between Weißensee and Potsdamer Platz follow the path of the proposed U10 line, but the U3 then crosses the Madgeburger Platz to Wittenbergplatz and follows the path of the existing U1 line to Uhlandstraße. Plans for the southwestern section of the U10 were abandoned for this routing because it ran parallel to the S-Bahn line S1 and was seen as redundant, although the economic impact of this redundancy has never been studied. In order to accommodate a transfer with the proposed U10 line, the upper station at Kurfürstendamm (the lower portion opened 1961), was built to accommodate wide and narrow gauge track, even though only the narrow gauge U1 and U9 lines run through that station.
Planning for the U10 was officially removed from the Berlin transport master plan in 2003 (Measures 2015), and it is no longer considered part of the public transport network master plan through at least 2030. The 1994 version of the line remains part of Berlin's Land-use policy, and construction must accommodate the eventuality of such a line. For example, the station under construction at Berliner Rathaus for the U5 line extension (set to open 2019) includes a lower tunnel for the proposed U10.