SJ O

O is a series of electric locomotives used by Swedish State Railways (Swedish: Statens Järnvägar, SJ) for hauling heavy iron ore trains on the Iron Ore Line in Sweden. The type Oa locomotives were built by Siemens and type Ob were built by ASEA.

O
Unit on the Iron Ore Line in 1950
Type and origin
Power typeElectric
BuilderASEA
Siemens
Build date1914-1915 (Oa)
1915 (Ob)
Total produced11 pairs (Oa)
2 pairs (Ob)
Specifications
Configuration:
​
 • UIC(1′C)+(C1′)
Gauge1,435 mm (4 ft 8+1⁄2 in) standard gauge
Wheel diameter1,100 mm (43.31 in)
Length18.62 m (61 ft 1+1⁄8 in)
Loco weightapprox. 1,368 t
(1,346 long tons; 1,508 short tons) (Oa)
1,258 t
(1,238 long tons; 1,387 short tons) (Ob)
Electric system/s15 kV  16.7 Hz AC Catenary
Current pickup(s)Pantograph
Performance figures
Maximum speed60 km/h (37 mph)
Power output1,200 kW (1,600 hp)
Career
OperatorsSwedish State Railways

History

The O series was built for the first electrified railway in Sweden, Malmbanan. ASEA started testing out technology with a test unit in 1908, and by 1914 the first Oa locomotive was delivered, along with the passenger hauling Pa. At first it was the northern part of Malmbanan, from Kiruna to Narvik that was electrified. The steam locomotives had been hauling 28 wagons at 10 km/h, but the new agreement signed in 1913 with LKAB meant that SJ had to haul 40 wagons at 30 km/h to transport enough ore. The solution lay in a joint production between Siemens of Germany and ASEA. The Siemens locomotives were designated Oa while the ASEA locomotives were designated Ob. The trains had 1200 kW motors.[1]

These stayed in service on the northern section until 1923 when the southern section to Luleå also was electrified, at which time they were moved to the southern section. A new series of Oe and Of locomotives were delivered. In the 1950s when larger trains were put into service, some of the Ofs were rebuilt to triple units, designated Of3. They were also supplemented with the new Dm-series that eventually replaced them.

Of class locomotive pulling an iron ore train

References
  1. "SJ Oa 1 blev tillverkad av Siemens i 1914". Retrieved 2013-02-03.


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