 The last stretch was financed through a separate company, A/S Ugla-Lian, that built the line and received 5 øre per rider on the line.The peak of Gråkallbanen was during World War II when the line had 2 million passenger annually - the trams were the only transport system operational during the war.After the war new investments were made, including loops in the city (1946) and at Lian (1947), double track from Breidablikk to Nordre Hoem (1948) and a new depot and workshop at Munkvoll in 1953.