S-Bahn

The S-Bahn ( , ) is a hybrid urban–suburban rail system 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 (lit. rapid train), (lit. city train) or (lit. rapid city train).

Similar systems in Austria and German-speaking 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 , and in the Czech Republic as Esko or S-lines. In Milan, they are known as Linee S. Provided by Wikipedia