This article may be expanded with text translated from the corresponding article in the German Wikipedia. (December 2012)
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Until 1993 U3 referred to the section of line between Wittenbergplatz and Uhlandstraße. In 1993, this section was renumbered to U15 and became a branch of the U1.
With the change of train numbers in December 2004 some confusion can now arise, as the planned final phase of the U3 line from Theodor-Heuss-Platz via Westkreuz, Adenauerplatz, Kurfürstendamm, Wittenbergplatz, Lutzowplatz, Potsdamer Platz and Leipziger Straße to Alexanderplatz, and from there on to Weißensee, will overlap with the present course of the U3, as the provisional name would be. Hence, the working title for this U3 was changed to"U10" - a name that had become vacant since plans for another U10 had been shelved after the political change and the reactivation of the S-Bahn in West Berlin.