| EMD SD50 |
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| Specifications |
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Configuration:
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| • UIC | Co'Co' |
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| Gauge | 1,435 mm (4 ft 8+1⁄2 in) |
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| Length | 71 ft 2 in (21.69 m) |
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| Fuel type | Diesel |
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| Fuel capacity | 3,500 U.S. gal (13,000 L) |
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| Lubricant cap. | 283 U.S. gal (1,070 L) |
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| Coolant cap. | 250 U.S. gal (950 L) |
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| Sandbox cap. | 56 cu ft (1,600 L) |
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| Prime mover | EMD 16-645F3B |
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| RPM: | |
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| • Maximum RPM | 950 |
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| Engine type | V16 diesel |
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| Aspiration | Turbocharged |
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| Alternator | main : AR16/D18 (3,500), AR11 (3,600) |
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| Traction motors | EMD 87Y (3,500), EMD 87A (3,600) |
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| Cylinders | 16 |
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| Transmission | Diesel-electric |
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| Gear ratio | 70:17 |
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| MU working | Yes |
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| Loco brake | Westinghouse, Dynamic brake |
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| Train brakes | Air braked |
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| Performance figures |
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| Maximum speed | 70 mph (110 km/h) |
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| Power output | 3,500 hp (2,610 kW) at 950 rpm; increased to 3,600 hp (2,685 kW) November 1984. |
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| Career |
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| Operators | See Original buyers |
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| Disposition | Some in service, some retired, one preserved |
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The EMD SD50 is a 3,500-horsepower (2,610 kW) diesel-electric locomotive built by General Motors Electro-Motive Division. It was introduced in May 1981 as part of EMD's "50 Series"; production ceased in January 1986. The SD50 was a transitional model between EMD's Dash 2 series which was produced throughout the 1970s and the microprocessor-equipped SD60 and SD70 locomotives. A total of 431 were built.
