The JB, the Jungfraubahn is an 1000 millimetre gauge rack railway electrified at 1125 volts, which runs 9 kilometres from Kleine Scheidegg to the highest railway station in Europe at Jungfraujoch. The railway runs almost entirely within a tunnel built into the Jungfrau mountain and contains a halt in the middle of the tunnel where passengers can disembark to observe the neighbouring mountains through windows built into the mountainside.
The JB is under the management of the Jungfraubahn Holding company, which also comprises the WAB -- Wengener Alp Bahn -- which links to the JB at Kleine Scheidegg and has two routes down the mountain, to Lauterbrunnen and Grindelwald, from where the BOB (Berner Oberland Bahnen) connects to the Federal Railways at Interlaken.
See also: Mountain railway