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 Height 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.

External links

• Järnväg.net on Mg (Swedish)