Berlin Hauptbahnhof fall of the Berlin Wall in 1989, city planners began work on a transport plan for reunified Berlin. One element of this became the "Pilzkonzept" (mushroom concept), in which a new north-south railway line intersecting the Stadtbahn was to be constructed. The name derived from the shape formed by the new line and existing lines, which vaguely resembles a mushroom. In June 1992 the federal government decided that the new station should be built on the site of Lehrter Bahnhof. While close to the centre of Berlin and government buildings, the area was still not heavily populated. The following year,
Berlin-Wannsee station is that there is only Potsdam-Griebnitzsee shuttle until it was discontinued in 1962. Residents commuted only to East Berlin via the longer Berlin outer ring from Potsdam through regional express trains, and the only trains running on the Berlin–Magdeburg railway was transit traffic from the West Berlin via the GDR to West Germany and other countries. Later on, after the fall of Berlin Wall, the line was re-connected to Potsdam again. Reconstruction began in April 1991 and was completed in 1 April 1992. Between the fall of Berlin Wall and 1 April 1992, Potsdam was connected through the fastest way