RjB 20, 21 and 22 were three diesel-hydraulic locomotive

Locomotive

A locomotive is a railway vehicle that provides the motive power for a train. The word originates from the Latin loco – "from a place", ablative of locus, "place" + Medieval Latin motivus, "causing motion", and is a shortened form of the term locomotive engine, first used in the early 19th...

s operated by Norsk Transport

Norsk Transport

Norsk Transport AS was a railway- and shipping company responsible for the transport of chemicals from Norsk Hydro Rjukan. A subsidiary of Norsk Hydro, the company was founded in 1907 and operated until 1991....

 on Rjukanbanen

Rjukanbanen

The Rjukan Line , at first called the Vestfjorddal Line, was a Norwegian railway line running through Vestfjorddalen between Mæl and Rjukan in Telemark. The railway's main purpose was to transport chemicals from Norsk Hydro's plant at Rjukan to the port at Skien, in addition to passenger transport...

 in Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. They were mostly used for shunting at Rjukan

Rjukan Station

Rjukan Station is the terminal railway station of Rjukanbanen, located at Rjukan in Tinn, Norway.The station opened as part of the railway on 9 August 1909 as Saaheim, until renaming to Rjukan on 15 November 1912. It was rebuilt 1959-60 and closed on 5 July 1991; after the closing the local radio...

 and at Mæl

Mæl Station

Mæl Station is a railway station on Rjukanbanen and where the railway cars on the line were transferred to the railway ferry to Tinnoset. The station is located 16 km from Rjukan and on the mouth of the river Måna in Vestfjorddalen where the river runs into Tinnsjå.The station was built in...

.

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

Norsk Hydro ASA is a Norwegian aluminium and renewable energy company, headquartered in Oslo. Hydro is the fourth largest integrated aluminium company worldwide. It has operations in some 40 countries around the world and is active on all continents. The Norwegian state holds a 43.8 percent...

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