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.

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S27
An S27 at Ziegelbrücke in January 2022
Overview
First service	15 June 2014 (2014-06-15)
Current operator(s)	Südostbahn
Route
Termini	Ziegelbrücke Siebnen-Wangen
Stops	5
Distance travelled	13.7 kilometres (8.5 mi)
Average journey time	12 minutes
Service frequency	10 round-trips on weekdays
Line(s) used	Lake Zürich left-bank
Route map Legend S2 S25 to Pfäffikon SZ 0:00 Siebnen-Wangen S2 S25 0:02 Schübelbach-Buttikon 0:05 Reichenburg 0:08 Bilten S17 S6 to Uznach 0:12 Ziegelbrücke S6 S25 to Schwanden S2 S17 to Unterterzen This diagram: view talk edit

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The S27 is a weekday-only rush-hour service. Five trains operate in each direction between Ziegelbrücke and Siebnen-Wangen 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.^[1]

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.^[2] 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.^[3]