Vienna S-Bahn in the context of "S-train (Copenhagen)"

The Copenhagen S-train (Danish: S-tog), the S-train of Copenhagen, Denmark, is a key part of public transport in the city. It is a hybrid urban-suburban rail serving most of the Copenhagen urban area, and is analogous to the S-Bahn systems of Berlin, Vienna and Hamburg. The trains connect the Copenhagen inner city with Hillerød, Klampenborg, Frederikssund, Farum, Høje-Taastrup and Køge. There are 170 km (110 mi) of double track with 87 S-train stations, of which eight are in neighbouring towns outside greater Copenhagen.

The S-train is run by DSB S-tog A/S while Banedanmark owns the tracks and signals. Rail services are operated by "Fourth Generation" S-trains divided into 104 8-car train sets (Class SA) and 31 4-car train sets (Class SE).