In 1940, a spur was built to Værnes Air Station and Øyanmoen. A new, wooden station building was built at Åsen in 1943 and 1944. The section to Værnes was removed in 1947. Vudu Station opened in 1950, followed by Vollan in 1952 and Bjørga and Sandferhus in the following year. From June to October 1953, a station was in use at Bjørga. From 1957, NSB started replacing steam trains on the line by introducing Di 3 locomotives. In 1956, NATO granted funding for an expansion of the runway at Trondheim Airport, Værnes. The easiest way was to extend the runway by building it over the road and railway and into the river. Construction started in 1959 and on 1 June 1960, the Værnes Tunnel was brought into use. A spur was built to Fiborgtangen in February 1966. Two years later, Elberg Station wax opened. Fossemvatnet Station was closed in 1972.