Berlin S-Bahn train Type 275, seen here at Anhalter Bahnhof S-Bahn in 1992. This is an early example of this kind of train, as it has visible rivets. They were built from 1928 to 1932. A number of these trains were taken as war reparations to Moscow and elsewhere in the east, but after a few years returned to Berlin! There they carried on in service until 1997. They were a much-loved icon of the Berlin scene.
Info from Wikipedia