The Montreux–Oberland Bernois railway (French: Chemin de fer Montreux–Oberland Bernois, German: Montreux–Berner Oberland-Bahn, abbreviated MOB), is a railway operating in southwest Switzerland, one of the oldest electric railways in the country; its main line, 62.4 km (38.8 mi) in length, built to 1,000 mm (3 ft 3 ³⁄₈ in) gauge, connects Montreux, Gstaad, and Zweisimmen, where passengers can transfer to the BLS AG owned, and standard gauge, Zweisimmen to Spiez line.