SJ Mg

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Mg
Mg 620 i Gävle.jpg
SJ Mg 620
Type and origin
Power typeElectric
BuilderASEA
Build date1944-45
Total produced17
Specifications
Configuration:
 • UICCo′Co′
Gauge1,435 mm (4 ft 8+12 in)
Wheel diameter1,000 mm (39.37 in)
Length16,800 mm (55 ft 1+38 in)
Height4,500 mm (14 ft 9+18 in)
Loco weight102 tonnes (100 long tons; 112 short tons)
Electric system/s15 kV  16.7 Hz AC Catenary
Current pickup(s)Pantograph
Performance figures
Maximum speed80 km/h (50 mph)
Power output2,640 kW (3,540 hp)
Tractive effort300 kN (67,000 lbf)
Career
OperatorsStatens 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 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. 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.

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