Dm and Dm3 is a series of
locomotives used by
Swedish State Railways
The Swedish State Railways ( sv, Statens Järnvägar) or SJ, originally the Royal Railway Board ( sv, Kungl. Järnvägsstyrelsen), was the former government agency responsible for operating the state-owned railways in Sweden.
It was created ...
( sv, Statens Järnvägar, SJ) and later
Malmtafik i Kiruna (MTAS) for pulling
iron ore
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the ...
trains on the
Iron Ore Line
The Iron Ore Line ( sv, Malmbanan) is a long railway line between Riksgränsen and Boden in Norrbotten County, Sweden, owned by Trafikverket (the Swedish Transport Administration). The line also contains two branches, from Kiruna to Svappav ...
in Sweden and
Ofoten Line in Norway. A total of 39 double-locomotives (Dm) were delivered between 1954 and 1971, built by
ASEA
''Allmänna Svenska Elektriska Aktiebolaget'' ( English translation: General Swedish Electrical Limited Company; Swedish abbreviation: ASEA) was a Swedish industrial company.
History
ASEA was founded in 1883 by Ludvig Fredholm in Västerås as ...
. A further 19 center locomotives (Dm3) were later delivered.
Norwegian State Railways
Vygruppen, branded as Vy, is a government-owned railway company which operates most passenger train services and many bus services in Norway. The company is owned by the Norwegian Ministry of Transport. Its sub-brands include Vy Buss coach se ...
also operated 12 similar locomotives, designated
NSB El 12
NSB El 12 was an electric locomotive used by the Norwegian State Railways (NSB) to haul iron ore trains on Ofoten Line between 1957 and 1990. The locomotives were based on the Swedish Dm that was used with success on the connecting Iron Ore ...
. The Dm is a articulated, freight-optimized version of the
Da-locomotive.
History
The
iron ore
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the ...
trains on the Iron Ore Line between
Luleå in Sweden and