A Dm3 in MTAB colors at Abisko Östra
|Type and origin|
|UIC classification||1'D+D1' (Dm)
|Gauge||1,435 mm (4 ft 8 1⁄2 in)|
|Wheel diameter||1,530 mm (5 ft 0.24 in)|
|Length||25,100 mm (82 ft 4.2 in) (Dm)
35,250 mm (115 ft 7.8 in)(Dm3)
|Locomotive weight||190 t (187.0 long tons; 209.4 short tons)
273.2 t (268.9 long tons; 301.2 short tons)
|Electric system(s)||15 kV 16⅔ Hz AC Catenary|
|Maximum speed||75 km/h (47 mph)|
|Power output||4,800 kW (6,400 hp) (Dm)
7,200 kW (9,700 hp) (Dm3)
|Tractive effort||940 kN (210,000 lbf) (Dm3)|
Dm and Dm3 is a series of locomotives used by Swedish State Railways (Swedish: Statens Järnvägar, SJ) and later Malmtafik i Kiruna (MTAS) for pulling iron ore trains on the Iron Ore Line in Sweden and Ofoten Line in Norway. A total of 39 double-locomotives (Dm) were delivered between 1953 and 1971, built by ASEA. A further 19 center locomotives (Dm3) were later delivered. Norwegian State Railways also operated 12 similar locomotives, designated NSB El 12. The Dm is a slower, freight-optimized version of the Da-locomotive.
The iron ore trains on the Iron Ore Line between Luleå in Sweden and Narvik in Norway had been using the Of for a long time, and the Swedish State Railways chose to order new locomotives for the Iron Ore Line at the same time as they ordered the Da-locomotives. At first 24 double locomotives were delivered in 1953, but in the 1960s SJ ordered additional 15 double sets. These were given more powerful engines, though the older five double sets were later rebuilt. These double locomotives could pull 3,400 tonne trains, but this was not sufficient during the end of the 1960s so SJ ordered 19 new center locomotives. These were mounted permanently between each of the Dm-locomotives, without its own drivers cabin, and designated Dm3. This allowed trains up to 5,400 tonnes. Instead of ordering Dm3s, NSB chose a different and more powerful locomotive, the NSB El 15. From 1979 and a few years onward the cabins were modernised, with new instrumentation and less noise.
In the 1980s most of the double locomotive sets were moved other places on SJs network. In 1996 the operation of the Iron Ore Line was transferred to MTAB, who also took over all the triple engines and some of the double engines. They were redesignated Dm2 (for double locomotives) and Dm3 for triple locomotives. From 2000 the new IORE locomotives were delivered, and all the Dm2s and some of the Dm3s were taken out of service. In 2004 one set was donated to the heritage society Malmbanans Vänner, who also owns one El 12. MTAB announced that the Dm3 will be put out of service in 2011, when enough IORE locomotives were available to relieve them.
All MTAB locomotives are named after one of the mines of the LKAB.
|974-983-975||Malte||initially only Dm2 (974-975); 1999 rebuilt to Dm 3 with mid engine of 982-983-984. 2002 scrapped|
|976-977-978||Bruno||no modernisation, since 2002 historical locomotive|
|982-983-984||1996 out of service, 1999 mid engine 983 used in Dm2 974/975|
|1203-1233-1204||- - - -||1988 out of service and used as spare part locomotive, 1991 scrapped|
|1213-1237-1214||Johan||since 2004 out of service|
|1221-1240-1222||-||19-03-1993 accident in Katterat (N), scrapped at place and removed from the SJ rolling stock register in November 1993.|
|Wikimedia Commons has media related to Dm3.|