The Lauterbrunnen–Mürren Mountain Railway (German: Bergbahn Lauterbrunnen–Mürren, BLM, also known as Mürrenbahn) is a hybrid transport system in the Bernese Oberland area of Switzerland, which connects the villages of Lauterbrunnen and Mürren.

[1][2][3] The line provides a vital passenger and goods link to the resort village of Mürren, which is situated above the cliffs of the Lauterbrunnen Valley and has poor road access.

[5] 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.

[1][6] The key milestones in the history of the line are:[citation needed] The BLM commences from Lauterbrunnen, using a terminus that is directly opposite the platforms of the Berner Oberland-Bahn (BOB) to Interlaken, and the Wengernalpbahn (WAB) to Kleine Scheidegg and Grindelwald.

[2][4][8] The rail section is operated by single electric railcars, often towing or pushing a flat car for goods, with a journey time of 14 minutes.

In September 2019 it was announced that Jungfraubahn Holding AG had awarded Stadler Rail at Bussnang a contract to supply three trainsets for at a cost of 17.3m Swiss francs.