Berlin Central Station in a watertight excavation of tunnels for the first section of a new urban railway line will be built, ranging from the stations West Harbor / Wedding on the northern ring to the central station. The plan is to extend the distance over Potsdamer Platz to the south cross. 2020, stop at a temporary platform at the central station of the first S-rail train. Travelers from the northern districts of Berlin come faster and more convenient to main train station in the capital.
Further information: https://bauprojekte.deutschebahn.com/p/berlin-s21