The S14 operates every 30 minutes between Weinfelden and Konstanz, except on Sundays when it operates hourly. In Konstanz, an hourly connection is made with a RegioExpress service to and from St. Gallen and Herisau. The hourly Lucerne–Konstanz InterRegio 75 supplements the S14. An additional S14 operates an hourly shuttle service between Konstanz and Kreuzlingen; this, with the regular S14 service and the IR 75, creates a 15-minute frequency between the two cities.[4]