SJ Mg

Mg
Type and origin
Power type Electric
Builder ASEA
Build date 1944-45
Total produced 17
Specifications
AAR wheel arr C-C (Co-Co)
UIC class Co'Co'
Gauge 1,435 mm (4 ft 8 1⁄2 in)
Wheel diameter 1,000 mm (39.37 in)
Length 16,800 mm (55 ft 1 3⁄8 in)
Height 4,500 mm (14 ft 9 1⁄8 in)
Loco weight 102 tonnes (100 long tons; 112 short tons)
Electric system(s) 15 kV 16 2⁄3 Hz AC Catenary
Current collection Pantograph
Performance figures
Maximum speed 80 km/h (50 mph)
Power output 2,640 kW (3,540 hp)
Tractive effort 300 kN (67,000 lbf)
Career
Operators Statens 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. 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.

References

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