Passenger service on the line now forms part of the St. Gallen S-Bahn, branded as the S21.

The line, which originally ran almost completely on track laid on roads, has been largely moved over the years to its own route.

[11] With a gradient of up to 7.6%, the Trogen Railway was the steepest narrow-gauge adhesion line in Switzerland prior to the opening of the Ruckhalde Tunnel.

[2] Since the opening of the St Gallen cross-city line on 6 October 2018, it has been operated as part of the Appenzell–St.

After leaving this platform, the Trogen line runs onto the street in front of the main station building.

Initially the lines runs on the northern side of the road, passing through the stops of Birnbäumen, Notkersegg, Schwarzer Bären and Rank.

Once past the latter stop, the views to the north expand to include Lake Constance.