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The units served, along with trailer cars on the first mainline electrified railway, the Drammen Line. Two were delivered in 1931; two more in 1933. They proved to be underpowered, and were not used on the most heavily trafficked part of the line; mostly serving on trains to Asker or Heggedal. 62.02 was involved in an explosion at Filipstad on 13 December 1943 and retired. The units were not compatible with the newer NSB BM65 units delivered from 1936, and were dispatched to Ofotbanen in 1952 where they served until 1970, except for 62.01 that was transferred to Kristiansand to be used on local trains on the Sørland Line, remaining in service until 1965.