SJ Mg (original) (raw)

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Mg
SJ Mg 620
Type and originPower typeElectricBuilderASEABuild date1944-1945Total produced17
SpecificationsConfiguration:​ • UICCo′Co′Gauge1,435 mm (4 ft 8+1⁄2 in)Wheel diameter1,000 mm (39.37 in)Length16,800 mm (55 ft 1+3⁄8 in)Height4,500 mm (14 ft 9+1⁄8 in)Loco weight102 tonnes (100 long tons; 112 short tons)Electric system/s15 kV 16.7 Hz AC CatenaryCurrent pickup(s)Pantograph
Performance figuresMaximum speed80 km/h (50 mph)Power output2,640 kW (3,540 hp)Tractive effort300 kN (67,000 lbf)
CareerOperatorsStatens Järnvägar

Mg is an electric locomotive used by Swedish State Railways (Swedish: Statens Järnvägar, SJ) for hauling freight trains. It was built in 17 copies by ASEA and was in service until 1980.

The Mg-series was built for the electrification of Norra Stambanan in the 1940s. It was steeper and more curved than the main lines in Southern Sweden, and single-track sections meant that long freight trains had to be used to make best use of line capacity. The D-series was not powerful enough and the Of-series was too long for the curves. But as experience of the building of bogie-locomotives increased, a Co'Co'-design was chosen for Mg, as the first bogie-locomotive in Sweden.[[[Wikipedia:Citing%5Fsources|page needed]]]-1" title="null">[1] More power also meant that the direct current motors from the D-series had to be replaced with the alternating current motors of the F-series. The machine room was not symmetric, so the loco was not the same on the right and left side. The Mg was the basis for the Ma-series built in the 1950s.

  1. [[[Wikipedia:Citing%5Fsources|page needed]]]%5F1-0" title="null">^ Tore, Wretman & Grundstedt 1998, p. [_page needed_].