The S9 is a railway service of the St. Gallen S-Bahn that provides half-hourly service between and over the WilâÂÂEbnat-Kappel line. THURBO, a joint venture of Swiss Federal Railways and the canton of Thurgau, operates the service.
The S9 operates every 30 minutes between and , using the WilâÂÂEbnat-Kappel line. It is the only service over that line between Wil and .
The route follows the left bank of the River Thur through the lower Toggenburg Valley.
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Until the December 2013 timetable change, every other S9 service continued south to , providing hourly service to the remainder of the WilâÂÂEbnat-Kappel line and the short section of the BodenseeâÂÂToggenburg line between Nesslau-Neu St. Johann and . With the timetable change, the S9 was cut back to its present terminus and the former S8 (which later merged with the former S1) extended to Nesslau-Neu St. Johann.