Kristine Valdresdatter, officially known as NSB Cmb17a or Class 17, was a single railcar built by Strømmens Værksted in 1935.

This gave a power output of 90 kilowatts (120 hp) and a maximum speed of 100 kilometers per hour (62 mph).

Kristine Valdresdatter was a three-axle railcar, with a bogie at the front and a carrier axle at the back.

Built by Strømmens Værksted, it was design-wise similar to the Gullfisk trams which had been delivered to the Oslo Tramway.

[3] Part of the reason for the early retirement was that the railcar only had a driver's cab in one end, making it difficult to turn.