Ulriken Tunnel is a railway tunnel

Tunnel

A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end.A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers...

 on the Bergen Line between Bergen Station and Arna Station

Arna station

Arna Station is the second largest railway station in Bergen, Norway; located in the Arna borough on the east side of Ulriken and between the two tunnels Ulriken Tunnel and Arnanipa. The present station was opened in 1964, when the tunnels was completed...

 in Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. The 7670 metres (25,164 ft) long tunnel runs under the northern part of the mountain Ulriken

Ulriken

Ulriken is the highest of the Seven Mountains that surround Bergen, Norway. It has an altitude of 643 metres above sea level....

 in Bergen

Bergen

Bergen is the second largest city in Norway with a population of as of , . Bergen is the administrative centre of Hordaland county. Greater Bergen or Bergen Metropolitan Area as defined by Statistics Norway, has a population of as of , ....

. Before the tunnel was opened in 1964, the Bergen Line ran via Nesttun

Nesttun

Nesttun is an urban centre and neighbourhood in the southern parts of the city of Bergen, Norway, located approximately 10 km south of the city centre. It was the centre of Fana municipality, which merged with Bergen in 1972, and is today the administration centre of Fana borough. Nesttun...

. This stretch is now a heritage railway

Heritage railway

thumb|right|the Historical [[Khyber train safari|Khyber Railway]] goes through the [[Khyber Pass]], [[Pakistan]]A heritage railway , preserved railway , tourist railway , or tourist railroad is a railway that is run as a tourist attraction, in some cases by volunteers, and...

, the Old Voss Line. The tunnel has single track and is electrified. The Norwegian National Rail Administration has plans for building a second track through the mountain.