The Oslo tunnelbane began as a network of suburban railroads which finally were connected through a city tunnel to form today's network of T-bane lines. All western lines had their terminus station at Majorstuen until a 2 km long tunnel was built to Nationaltheatret in 1928. Line 4 to Bergkrystallen was opened as a metro line in 1966 although part of the line had been used for light rail before. So, since 1995 all 5 lines run through the shared metro tunnel from east to west. The second stage from Storo to Carl Berners plass is expected to open in 2006.
Tickets have to be validated before starting the first trip.
Frequency is every 15 minutes during daytime on all branches which amounts to a 3 minutes headway on the common central section. This is a metroPlanet Europe page designed by Robert Schwandl .