The Holmenkollen Line (Norwegian: Holmenkollbanen) is an 11.4-kilometre (7.1 mi) long line of the Oslo Metro between Majorstuen and Nordmarka in Oslo, Norway. It is served by Line 1 of the metro, and is the line with the least passengers and the only to still have level crossings and short station platforms. The line runs mostly through residential areas with single dwellings, but the upper parts of the line mainly serve the recreational area of Nordmarka. Holmenkollen Station is located close to Holmenkollen National Arena which hosts international Nordic skiing tournaments.
The line is the oldest of the metro, and was opened as a light rail in 1898 by the company Holmenkolbanen. Originally it ran 6.2 kilometers (3.9 mi) from Majorstuen Station to Besserud. In 1916, the line was extended to Tryvann, with the last 1.4 kilometers (0.87 mi) only being used for freight. In 1928, the city terminus was moved 2.0 kilometres (1.2 mi) to the underground Nationaltheatret Station.
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The line was extended in 1916 to Frognersaeteren which is how Lowry must have travelled to the resort on his 1931 trip to Norway. He later described to his wife Jan Gabrial in a letter dated Summer 1933 how to get there; "go down the Holmerkollen, from there, which is the Oslo underground, just turn to the left at the Nationaltheatret exit from Røde Mølle, that being an ugly looking theatre with Ibsen, Bjornsen & Heiberg outside it, & walk up the hill a bit, the entrance to the underground is on the middle of the square behind the Nationaltheatre - go down the right entrance, & when you see a tram come along with Frognarsaeteren on its forehead, take it, pay 90 ore I think it is, go all the way; it will take you up a mountain which is just the best thing in the world & there's a restaurant up there where they speak German for you." (Collected Letters Vol. 1 Pgs. 130-131).