RegioExpress in the context of "List of railway stations in Zurich"

The Zurich S-Bahn (German: S-Bahn Zürich) system is a network of rail lines that has been incrementally expanded to cover the ZVV area, which comprises the entire canton of Zurich and portions of neighbouring cantons (Aargau, Glarus, Schaffhausen, Schwyz, St. Gallen, Thurgau and Zug), with a few lines extending into or crossing the territory of southern Germany. The network is one of many commuter rail operations in German speaking countries to be described as an S-Bahn. The lines connect with services of Aargau S-Bahn to the West, Basel S-Bahn (only in Waldshut) and Schaffhausen S-Bahn to the North, St. Gallen S-Bahn to the East, and Lucerne S-Bahn/Zug Stadtbahn to the South, as well as with InterCity, InterRegio and RegioExpress services at major junction stations.

The entire ZVV S-Bahn network went into operation in May 1990, although many of the lines were already in operation.

The public transportation network of the Zürcher Verkehrsverbund (ZVV) is divided into 45 fare zones covering Zurich, Switzerland, and nearby regions, mostly in the canton of Zurich. The fare zones (Tarifzonen) are numbered 110 to 184, with zones 180 to 184 designating those outside of the canton of Zurich (Aargau, Schwyz and St. Gallen), while zone 114 includes the southern part of the canton of Schaffhausen and zone 162 part of the canton of Thurgau. The city of Zurich corresponds to fare zone 110. The network covers a major portion of the Zurich metropolitan area.

Trips by tram/light rail, bus, fast and regional trains, such as InterCity (IC), InterRegio (IR), RegioExpress (RE), S-Bahn (S), even international trains (such as EuroCity Zürich HB–Munich), by any operator, are part of the fare network as long as the start and end of the journey both lie within the fare network's boundaries (see integrated ticketing). Passengers can use all modes of public transport within the fare zones covered by their ticket.