In Norway, a number of main lines were in the 19th century built with narrow gauge, , to save cost in a sparsely populated mountainous country. This included Norway's first own long-distance line, the Røros Line, connecting Oslo and Trondheim, 1877. Some secondary railways also had this gauge. These railways have been rebuilt to standard gauge or closed down. Some private railways had and one had . A few railways partly still are operated as museum railways, specifically the Thamshavn Line, Urskog–Høland Line and the Setesdal Line. The Trondheim Tramway is also narrow gauge.
List of narrow-gauge lines Line Length Opened Gauge Converted Notes Ålgård Line 1921 1944 Branch of the Sørlandet Line Brevik Line 1895 1921 Branch of the Vestfold Line Drammen Line 1872 1922 Flekkefjord Line 1904 1941 Closed in 1989 Grimstad Line 1907 1936 Closed in 1961 Hokksund–Kongsberg 1871 1909 Since renamed to the Sørlandet Line Holmestrand–Vittingfoss Line 1902 — Closed in 1938 Horten Line 1881 1949 Branch of the Vestfold Line Jæren Line 1878 1944 Since 1944 part of the Sørlandet Line Krøderen Line 1872 1909 Closed in 1985, now a heritage railway Lier Line 1904 — Closed in 1937 Lillesand–Flaksvand Line 1896 — Closed in 1953 Nesttun–Os Line 1894 — Closed in 1935 Randsfjorden Line 1866 1909 Røros Line 1862 1941 Converted in stages Setesdal Line 1895 — Closed in 1962. Opened as a heritage railway (first section) in 1966. Now runs on the preserved scenic stretch Grovane-Røyknes Sulitjelma Line 1892 1915 Built with gauge, converted to gauge, closed in 1972 Thamshavn Line 1908 — Electric. Closed in 1974, now a heritage railway Tønsberg–Eidsfoss Line 1901 — Closed in 1938 Trondhjem–Støren Line 1864 1921 Since 1877 part of the Røros Line and since 1921 part of the Dovre Line Urskog–Høland Line 1896 — Closed in 1960. Opened in 1966 as a heritage railway Vestfold Line 1881 1949 Voss Line 1883 1909 Since 1909 part of the Bergen Line
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