SJ Mg
| Mg | |
|---|---|
| Specifications | |
| Power type | Electric |
| Builder | ASEA |
| Build date | 1944-45 |
| Total produced | 17 |
| UIC classification | 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 1.4 in) |
| Height | 4,500 mm (14 ft 9.17 in) |
| Locomotive weight | 102 tonnes (100 long tons; 112 short tons) |
| Electric system(s) | 15 kV 16⅔ Hz AC Catenary |
| Current collection method | Pantograph |
| Top speed | 80 km/h (50 mph) |
| Power output | 2,640 kW (3,540 hp) |
| Tractive effort | 300 kN (67,000 lbf) |
| Career | |
| Railroad(s) | Statens Järnvägar |
Mg is an electric locomotive used by Statens Järnvägar of Sweden 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.
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