The Solbergfoss Line (Norwegian: Solbergfossbanen) was a 7.9-kilometer (4.9 mi) railway line which ran from Askim Station to Solbergfoss Power Station, entirely in Askim, Norway.

The single-track, standard gauge railway was an industrial railway operated by the power station owned by Oslo Lysverker and the Norwegian Water Resources and Energy Directorate.

It was originally planned to be demolished in 1922, but the passenger trains proved popular and it continued in use until 1965.

They issued an engineering competition, which concluded with that also Solbergfoss should be part of a hydropower station.

A committee was appointed in 1907 and recommended two years later that Mørkfoss and Solbergfoss be built at the same time.

[2] Construction of the track was carried out in 1913, and the government issued permission for a temporary line on 1 May 1914.

A Danish steam locomotive was bought in 1919 and an NSB Class 9 was borrowed in 1920.

Passenger transport proved popular and when construction of the power station was completed in 1922, there was public demand for operations to continue.

[6] Another advantage was that it would allow heavy machinery and other materials to be transported to the power station at a later date.

[8] The first railcar was bought in 1928, allowing both the remaining steam locomotives to be chopped in 1930.

Freight trains to the power station were thereafter operated using a shunter from SB.

These were driven to Askim and then transported onward to the Krøderen Line.

[2] The railway bought two railcars for its passenger services, named Gamla and Padda.