The Frauenfeld–Wil railway is a 1,000 mm (3 ft 3+3⁄8 in) metre gauge railway line[2] in Switzerland, which connects the town of Frauenfeld in the canton of Thurgau, to the town of Wil in the canton of St. Gallen, following the valley of the Murg river.

The Frauenfeld-Wil-Bahn (FWB) opened the line in 1887 and operated it until 2021, when that company merged into Appenzell Railways.

[3] The line is included in Tarifverbund Ostwind, and operates as service S15 of the St. Gallen S-Bahn.

[5][6][7] FWB closed the station at Murkart in 2018 in order to maintain connections with long-distance trains at Frauenfeld.

[8] S15 Frauenfeld – Wängi – Wil SG Freight trains ran on the line from 1907 until the early 2000s.