Mount Pilatus and the sea of fog. Cogwheel railcars Bhe 2/2 # 47 and # 48 of the Pilatus Bahn, steepest cogwheel railway of the world with up to 48 %, are running down from the Pilatus into the sea of fog, which was on about 1200 meter a.s.l. this day, to Alpnachstad.