What does S-BAHN stand for? 

S-Bahn

The S-Bahn is the name of hybrid urban-suburban rail systems serving a metropolitan region predominantly in German-speaking countries. Some of the larger S-Bahn systems provide service similar to rapid transit systems, while smaller ones often resemble commuter or even regional rail systems. The name S-Bahn derives from Schnellbahn (lit. rapid train), Stadtbahn (lit. city train) or Stadtschnellbahn (lit. rapid city train). Similar systems in Austria and Switzerland are known as S-Bahn as well. In Belgium, it is known as S-Trein (Flemish) or Train S (French). In Denmark, they are known as S-tog [ˈesˌtsʰɔˀw], and in the Czech Republic as Esko or S-lines. The metropolitan area of the Italian city of Milan has an S-Bahn-style commuter rail system too (Milan S Lines), though in this case the "S" stands for suburbano (lit. suburban).

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