The MOB begins its journey in Montreux, departing trains normally making use of platform 5 and arrivals platform 6, between the Swiss Federal Railway platforms and those of the rack and pinion railway to the Rochers de Naye. Winding its way up through the vineyards above Lake Geneva via Chamby, as far as Les Avants, the line passes through the crown tunnel under the Col de Jaman to reach the Saane Valley. In Montbovon there is a connection to the Transports Publics Fribourgeois (TPF; previously GFM) network. Following the Saane upstream, passing the famous hot-air ballooning centre of Château-d'Oex, it leaves the French-speaking canton of Vaud near Rougemont and enters the German-speaking canton of Berne. After Saanen the planners would have liked a direct ascent of the Sannenmöser Pass but without the aid of a rack and pinion system this was impossible and the line was diverted to loop around the village of Gstaad, adding greatly to the development and prosperity of the community. Beyond Gstaad railway station it begins the climb to the head of Saanenmöser Pass, the highest point on the line at 1270 m (3937 ft). On the other side it descends the Simmen Valley to Zweisimmen, where there is a connection to the standard gauge line of the BLS to Spiez.