The S-train is a type of hybrid urban-suburban rail serving a metropolitan region. Some of the larger S-train systems provide service similar to rapid transit systems, while smaller ones often resemble commuter or even regional rail. They are especially common in Germany and Austria, where they are …
Part of Berliner Stadtbahn. The tracks on the right belong to the S-train system and the trains stop at the Hackescher Markt station, while the other two tracks are for other train types, which do not stop at this station. Compare with photo of Vesterport station in Copenhagen below. The concept is the same.
Vesterport S-train station has three entrances. This is the main one.
Vesterport station is located below street level, but is not under ground. Other trains do not stop here, solely S-trains. Compare with picture of Berlin's S-train above. Same concept.