Cog railways radiate a unique fascination with their exceptional combination of mountain scenery and daring track layouts, featuring numerous bridges and tunnels. The movement of the train is facilitated by a cogwheel engaging with a rack rail located in the center of the track, as the ordinary friction between wheel and rail is no longer sufficient for the steep gradients. In cog railways of the so-called mixed system, where friction sections alternate with rack sections depending on the incline, the pulling force is exerted by the same machine. In the Alps, there are particularly many private cog railways that are very popular with tourists from all over the world.