It runs from Lauterbrunnen to Grindelwald via Wengen and Kleine Scheidegg, making it the world's longest continuous rack and pinion railway.

Through that holding company it is part of the Allianz - Jungfrau Top of Europe marketing alliance, which also includes the separately owned Berner Oberland-Bahn and Schynige Platte-Bahn.

[3] In 1875, the first plans for a railway on the route later taken by the Wengernalp line were drawn up, but the high projected costs meant that the concession expired.

Construction work commenced in 1891, and the following year the first steam locomotive reached Wengen on 18 April and Kleine Scheidegg on 10 August.

The electrification of the line between Lauterbrunnen and Kleine Scheidegg was completed on 3 June 1909 using 1500 V DC, with electric locomotives positioned, for safety reasons, at the lower end of the trains.

In 1990, an avalanche shelter was built on the Lauterbrunnen side of the operation, whilst in 1995 Wengen station was rebuilt to include a freight delivery terminal.

In 2011, a new double track loop was opened between Wengen and Allmend, allowing the introduction of a clock-face timetable between Lauterbrunnen and Kleine Scheidegg.

However, a triangular junction specially built into the mountainside at Kleine Scheidegg allows the train to be turned if necessary so that it can also be used on the other side of the col.

The line serves the following stations: A regular interval timetable is operated between Grindelwald and Kleine Scheidegg with trains running every half-hour morning and afternoon, except between late October and mid December when the service is hourly.

During mornings and afternoons they continue to Kleine Scheidegg, again half-hourly except between late October and mid December when the service is hourly.

Before December 2011, the Lauterbrunnen - Wengen - Kleine Scheidegg service was formed of 5 trains running at irregular intervals in every 2-hour period.

Following the construction of the new loop between Wengen and Allmend, the number of trains in each direction has been reduced from 5 to 4 in each 2-hour period, but departure and journey times have been standardised.