St. Gallen–Trogen railway
| St. Gallen–Trogen railway | |
|---|---|
| Overview | |
| Native name | Trogenerbahn |
| Status | Operational |
| Owner | Appenzell Railways |
| Service | |
| System | St. Gallen S-Bahn |
| Route number | 859 (earlier: 115a) |
| Technical | |
| Line length | 9.8 kilometres (6.1 mi) |
| Number of tracks | Mixture of single and double track |
| Track gauge | 1,000 mm (3 ft 3+3⁄8 in) metre gauge |
| Electrification | |
| Maximum incline | 7.6% |
The St. Gallen–Trogen railway, or Trogenerbahn (TB), is a 9.8 kilometres (6.1 mi) long railway line in Switzerland. It links the city of St. Gallen, in the canton of St. Gallen, with Speicher and Trogen, both in the canton of Appenzell Ausserrhoden. Passenger service on the line now forms part of the St. Gallen S-Bahn, branded as the S21.
The line was opened in 1903, and was built as an interurban. Whilst much of the line has been upgraded, this is still apparent in the long stretches of roadside track, and in its exit from St. Gallen over street track. With a gradient of 7.6%, it is the steepest narrow-gauge adhesion railway in Switzerland.
The line is owned and operated by the Appenzell Railways company, which also operates several other railway lines in the two Appenzell cantons. It has been operated as part of the Appenzell–St. Gallen–Trogen railway since 6 October 2018.