Mantena is a Norwegian

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...

 rolling stock

Rolling stock

Rolling stock comprises all the vehicles that move on a railway. It usually includes both powered and unpowered vehicles, for example locomotives, railroad cars, coaches and wagons...

 maintenance

Maintenance, repair, and operations

Maintenance, repair, and operations or maintenance, repair, and overhaul involves fixing any sort of mechanical or electrical device should it become out of order or broken...

 company owned by Norges Statsbaner (Norwegian State Railways). It has workshops at Grorud

Grorud

Grorud is a borough of the city of Oslo, Norway.The borough contains the Ammerud, Grorud, Kalbakken, Rødtvet, Nordtvet and Romsås areas. Traditionally a borough inhabited by the working class, Grorud has in the last few decades had a great influx of immigrants. 40% of the population are first or...

 and Lodalen in Oslo

Oslo

Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...

, Marienborg

Marienborg Station

Marienborg is a railway station located at Marienborg in Trondheim, Norway. The station is located on the Dovre Line at the point where the Stavne–Leangen Line branches off from the Dovre Line. The station has two platforms, one on each of the railway lines, the one track electrified and the other...

 in Trondheim

Trondheim

Trondheim , historically, Nidaros and Trondhjem, is a city and municipality in Sør-Trøndelag county, Norway. With a population of 173,486, it is the third most populous municipality and city in the country, although the fourth largest metropolitan area. It is the administrative centre of...

 as well as in Skien

Skien

' is a city and municipality in Telemark county, Norway. It is part of the traditional region of Grenland. The administrative centre of the municipality is the city of Skien. Skien is also the administrative centre of Telemark county....

 and Drammen

Drammen

Drammen is a city in Buskerud County, Norway. The port and river city of Drammen is centrally located in the eastern and most populated part of Norway.-Location:...

. In addition to NSB, customers include CargoNet

CargoNet

CargoNet AS is the primary operator of freight trains on the Norwegian railway system. It was formed as NSB Gods after NSB fissioned into a passenger and a freight company. NSB Gods changed its name to CargoNet at the beginning of 2002. It is owned by NSB and the Swedish freight company Green Cargo...

, Kollektivtransportproduksjon, Ofotbanen, Green Cargo, Hector Rail

Hector Rail

Hector Rail is a Swedish-based independent train haulage provider operating in the European rail transport market, operating 29 locomotives. The company provides locomotives and drivers to freight customers who need to have whole unit trains hauled between two places with a regular time table.The...

 and Tågkompaniet

Tågkompaniet

Tågkompaniet or Svenska Tågkompaniet AB is a Swedish railway company that operates franchises in Northern Sweden and Greater Stockholm. The company was founded in 1999 by three former railway employees in Statens Järnvägar and the investment company Småföretagsinvest/Fylkinvest...

. The company was separated from NSB as a separate limited company

Aksjeselskap

Aksjeselskap is the Norwegian term for a stock-based company. It is usually abbreviated AS or A/S, especially when used in company names. An AS is always a limited company, i.e. the owners cannot be held liable for any debt beyond the stock capital...

 in 2002. It has 900 employees and head offices in downtown Oslo. MiTrans, that performs rebuilding of rolling stock, is a wholly owned subsidiary of Mantena.