The Rorschach–Heiden railway (, RHB) is a railway line and former railway company in Switzerland. It is a standard gauge mountain rack railway, using the Riggenbach rack system and is part of Appenzeller Bahnen. The route links Rorschach with Heiden. The line is popular with tourists for its scenic views over Lake Constance. During the summer months, it is operated with old open coaches. Route The separate RHB line starts a half a kilometre east of Rorschach station, shortly after it branches off from the Rorschach – Chur line belonging to the Swiss Federal Railways (SBB). The property line is exactly at kilometre 64.41483. The entry signal from Heiden into the Rorschach train station is at kilometre 64.476. This position is often incorrectly stated as the property limit, but in fact it is the operational limit. The property line between SBB and AB and the zero point of the kilometers in the direction of Heiden are behind the SBB depot, directly in front of the two points in the Appenzeller Bahnen parking facility. The rack also begins immediately after the two switches. The gradient that begins afterwards is on average 91 ‰, the maximum value is 93.6‰. Above Wienacht Tobel, the route is a little flatter and only reaches 79.6‰. The route continues via the stations at Seebleiche, Sandbüchel, Wartensee, Wienacht-Tobel and Schwendi bei Heiden to Heiden. All intermediate stations are request-only stops. The terminal station in Heiden is at an altitude of 794 metres. The trains to Heiden start from Rorschach Hafen station, initially following a piece of the Romanshorn – Rorschach railway line operated by SBB to Rorschach station and from there the route towards St. Margrethen to the junction. The route runs through the local municipalities (communes) of Rorschacherberg (Seebleiche, Sandbüchel), Thal (Wartensee), Lutzenberg (Wienacht-Tobel), Heiden (Schwendi) and Grub (without a station) and ends in the municipality of Heiden. Current operations – – Rorschach Hafen Rorschach Heiden There is an hourly service, the S25 of St. Gallen S-Bahn, in each direction between and . The times in the early morning differ from those after 9:00 a.m. In the summer, steam-powered services are also offered. The historic summer wagons are used in regular operation; a bicycle wagon is used to transport bicycles. There is no longer freight traffic on the line, with the exception of our own construction trains, as the main customers Starrag and Wolfhalden grain mill