Complex sentence: The railcars were used on Vossebanen until the electrification in 1954 when they were transferred to Skreiabanen, though between 1957-61 one car was used between Voss and Myrdal.
Split into simpler sentences: The railcars were used on the Voss Line until the electrification in 1954, when they were transferred to the Skreia Line. However, between 1957 and 1961, one car was used between Voss and Myrdal.