The Kongsvinger Line was electrified in 1951, and there were proposals to quickly electrify the Solør Line, but these never materialized. The opening of a military base at Haslemoen in the 1950s had increased the patronage significantly and by 1961 it had 141,000 annual passengers, between thirteen daily services. From 1963 the number of passenger trains were decimated and instead bus services established. However, the road was of insufficient standard to allow the buses to operate without difficulties. The road was closed because of frost heaving every spring and three overpasses were too small for the buses. NSB retained three daily train services in each direction, using a single multiple unit.