The line from Bern to Thun was opened by the Swiss Central Railway on 1 July 1859.

It was not until 1893 that the Lake Thun Railway (Thunerseebahn) opened a connection to Därligen.

[3] The old line ran from the points at the western approach to the carriage sidings at Wylerfeld, continuing south of the grosse Allmend to Ostermundigen.

The first part of the Thun–Scherzligen line was electrified from 2 December 1918[4] to allow BLS trains to enter Thun station.

[5] With the construction and commissioning of the Lorraine viaduct and the building of the approach to Bern station along Dammstrasse/West Ring in 1941, the line via the Red Bridge was abandoned.

In local traffic, BLS AG operates line S1 of the Bern S-Bahn and the Bern–Brig/–Zweisimmen RegioExpress service (using Lötschberger sets).