Narrow gauge railways make it possible for visitors to travel in comfort from the resort of Interlaken in the Bernese Oberland to the highest railway station in Europe at Junfraujoch, 3454 m above sea level. From the station at Interlaken Ost, served also by trains from Lucerne across the Brunig Pass, visitors take the Berner Oberland Bahn train, along a metre-gauge line opened in 1890 and electrified in 1914, to Lauterbrunnen. Here travellers change to the Wengener Alpbahn, an 80 cm gauge line, most of which was opened in 1892 and electrified in 1909-10, and travel to Kleine Scheidegg, junction for the Jungfraubahn proper. It is also possible to take the Grindelwald branch of the Berner Oberland Bahn, and then travel to Kleine Schedegg on a Wengener Alpbahn train bound for Lauterbrunnen. The Jungfraubahn was opened in 1909 and its line of 9.3 km runs almost entirely through tunnels under the Eiger and Mönch mountains. Jungfraujoch station is at a height where deep snow persists through the summer months. Visitors are able to view the scenery through large windows. All the supplies for the refreshment rooms at the summit are carried up on the train. Passenger demand is heavy and the whole system is operated flexibly and with exemplary efficiency.