Kristine Valdresdatter, officially known as NSB Cmb17a or Class 17, was a single railcar built by Strømmens Værksted in 1935. The train has a Buda gasoline prime mover with a mechanical transmission. This gave a power output of 90 kilowatts (120 hp) and a maximum speed of 100 kilometers per hour (62 mph). Originally delivered to the private Valdres Line. The Norwegian State Railways (NSB) took over the line in 1937. It was used on the Numedal Line from 1939 and the Grimstad Line from 1947.