Passenger trains started running on 10 February 1941, also with two trains in each direction per day. Travel time was 65 minutes downhill and 80 minutes uphill. The official name of the line was decided by the ministry on 26 June 1941. From 1 May 1942, Rolf Aksnes took over as head engineer after Kielland. During construction of the Bergen Line in 1898, the upper part of Kjosfossen had been built up with a hydroelectric power station. Another power station was built there, and taken into use on 27 October 1944. Built by Kværner and Norsk Elektrisk & Brown Boveri (NEBB), it had a power output of .