Other Similar System
The term "RER" (Réseau express régional), used in France and western Switzerland, Servizio Ferroviario Suburbano (linee S) in Italy, SKM (Szybka Kolej Miejska) in Warsaw and Tricity in Poland are very similar to the S-Bahn. In the United Kingdom, Merseyrail (Liverpool) and the Tyne and Wear Metro are roughly equivalent to S-Bahns (see below for more details on suburban rail networks in the UK).
By contrast, U-Bahn trains are mainly underground and serve primary urban city centers (although some closer suburbs is covered, for instance Spandau in Berlin, and count legally as a kind of tramway in Germany, while the S-Bahn legally are a type of railway.
Read more about this topic: S-Bahn
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