S27 (Südostbahn)
The S27 is a rush-hour railway service that connects the Swiss municipalities of Wangen and Ziegelbrücke. Despite its name, it is not formally part of the St. Gallen S-Bahn or Zürich S-Bahn networks. Südostbahn, a private company primarily owned by the federal government and several cantons, operates the service. Operations 
The S27 is a weekday-only rush-hour service. Five trains operate in each direction between  and  in the morning and again in the evening. The S27 is the only regular service for the three intermediate stops, save a few late-night and early-morning stops by the S2 and S8 of the Zürich S-Bahn. History 
The S27 was introduced with the 15 June 2014 timetable change, replacing the S2 between Ziegelbrücke and Siebnen-Wangen. The S2 now ran express between those stops. With the December 2017 timetable change, the service level was significantly reduced: weekend trains were eliminated, and weekday service was reduced from half-hourly to rush-hour only. References

External links 
 2023 timetable

Railway services in Switzerland
Südostbahn