Seventeen a-series units were delivered in 1941 and equipped with 93-kilowatt (125 hp) Deutz prime mover.
Eight b-series units were delivered in 1952 and equipped with 110-kilowatt (150 hp) Scania-Vabis prime movers.
The a-series is equipped with a Deutz A6M517 engine, which gives a power output of 93 kilowatts (125 hp).
The b-series has a Scania-Vabis D802 prime mover with a power output of 110 kilowatts (150 hp).
NSB attempted to sell the units, but as no-one was interested in purchasing them, they were scrapped in 1972 and 1973.