EMD SW1200MG
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| Power type | Electric |
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| Service class | Locomotive |
| Type of service | Switcher |
| Builder | General Motors Diesel (GMD) |
| Serial number | A1945–A1949, A2176, A2558–A2560 |
| Model | SW1200MG |
| Build date | 1963 (5), 1968 (1), 1971 (3) |
| Total production | 9 |
| AAR wheel arr. | B-B |
| UIC classification | B'B' |
| Gauge | 4 ft 8½ in (1,435 mm) |
| Electric system(s) | 2400 V ac, 60 Hz |
| Current Collection method(s) | Overhead |
| Locomotive brakes | Straight air |
| Train brakes | 26-L air |
| Career | Iron Ore Company of Canada |
| Number(s) | 431501–431509 |
| Locale | North America |
| WikiProject Trains {{Infobox Locomotive Auto}} |
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The EMD SW1200MG was a 4-axle electric locomotive built by General Motors Diesel between 1963 and 1971. This locomotive was the electric version of the diesel powered SW1200, with the prime mover replaced by a motor-generator set, hence the MG suffix in the model number.
Locomotives run under 2400V 60 Hz, in automatic control without driver. The difference with SW1200 is that a single-phase electric motor is provided in place of the diesel motor, with adapted control.
Nine examples of this locomotive were built for a single Canadian customer – Iron Ore Company of Canada (IOC).
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