 The route length was designated at , with nine new stations.The new route was supposed to be opened in two phases, ending in 1988, to replace the terminus of the former Line E. Construction began on 1 March 1985, with the first to open being Biesdorf-Süd and Elsterwerdaer Platz, and then on to Hönow by 1 July 1989, just a few months before the fall of the Berlin Wall.The line was renumbered to U5 after the Wall fell, in 1 July 1990.