RjB 20, 21 and 22 were three

diesel-hydraulic A diesel locomotive is a type of railway locomotive in which the prime mover (locomotive), power source is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is con ...

locomotive A locomotive is a rail transport, rail vehicle that provides the motive power for a train. Traditionally, locomotives pulled trains from the front. However, Push–pull train, push–pull operation has become common, and in the pursuit for ...

s operated by

Norsk Transport Hydro Transport AS was a railway company, railway- and List of ship companies, shipping company responsible for the transport of chemicals from Norsk Hydro Rjukan. A subsidiary of Norsk Hydro, the company was founded in 1907, operations ceased in ...

on Rjukanbanen in

Norway Norway, officially the Kingdom of Norway, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of the Kingdom of ...

. They were mostly used for shunting at

Rjukan Rjukan () is a List of towns and cities in Norway, town in Tinn Municipality in Telemark county, Norway. The town is also the administrative centre of Tinn Municipality. The town is located in the Vestfjorddalen valley, between the lakes Møsvatn ...

and at Mæl. They were delivered in 1961, and remained in service until 1991 when the line closed; no. 20 remains at Rjukan, while no. 21 was sold to Pepeteries de Golbey of France and no. 22 was transferred to

Norsk Hydro Norsk Hydro ASA (often referred to as just ''Hydro'') is a Norway, Norwegian aluminium and renewable energy company, headquartered in Oslo. It is one of the largest aluminium companies worldwide. It has operations in some 50 countries around th ...

at Menstad.

References

Norsk Transport locomotives Diesel locomotives of Norway Railway locomotives introduced in 1961 1961 establishments in Norway Standard-gauge locomotives of Norway {{diesel-loco-stub