 In 1923, a connection was opened from Wiesenburg to Roßlau near Dessau.The section from Berlin to Wiesenburg was upgraded, but the Wiesenburg-Güsten section lost importance, since in addition to routes via Magdeburg, routes via Dessau were now available.In 1961, the section from Drewitz (now Potsdam Medienstadt Babelsberg) to Berlin–Wannsee was closed to passenger traffic, as a result of the building of the Berlin Wall.