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U-Bahn Linie 1
Changes to serviceDuring construction work between June 24 and November 10, 2011 on the U2, the U1 will be scaled back to run between Wittenbergplatz and Uhlandstraße only. Services between Warschauer Straße and Wittenbergplatz will be combined with the western portion of the U2 to form the temporary U12 line. See here for details.
The U1 is Berlin's oldest U-Bahn line, with the oldest section - built on a viaduct running westwards from Warschauer Straße along the course of the 19th century city walls - first opened in 1902.
The section of the U1's route west of Wittenbergplatz has been subject to frequent change. At its inception, the U1 continued from Wittenbergplatz to Ruhleben, a stretch now served by the U2. In 1993, following the reopening of the U2 between Wittenbergplatz and Mohrenstraße, the U1 and U2 swapped their western ends, with the U1 taking over the southwestern line to Krumme Lanke. The reason for this swap is the layout at Wittenbergplatz, which only enables non-conflicting train movements in this configuration.
In 2004 the western part of the route was changed yet again, with the U1 taking over the short stretch of line under the to Uhlandstraße, replacing the now defunct U15. The line to Krumme Lanke became the U3, a line number which had not been used since 1993.