High Quality Content by WIKIPEDIA articles! The Norwegian railway system comprises 4,087 km of 1,435 mm (4 ft 8+1?2 in) (standard gauge) track of which 2,622 km is electrified and 242 km double track. There are 696 tunnels and 2760 bridges. Jernbaneverket is a state owned agency which builds and maintains all railway tracks, while other companies operate them. These companies include Norges Statsbaner, NSB Anbud, CargoNet, Flytoget, Hector Rail, Tagakeriet and Ofotbanen. The first railway in Norway was Hovedbanen between Oslo and Eidsvoll and opened in 1854. The main purpose of the railway was to freight lumber from Mj sa to the capital, but also passenger traffic was offered. In the period between the 1860s and the 1880s Norway saw a boom of smaller railways being built, including isolated railways in Central and Western Norway.

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