| Southern Pacific Class DF-120 |
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| Specifications |
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Configuration:
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| • AAR | C-C |
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| Gauge | 4 ft 8 1⁄2 in (1,435 mm) standard gauge |
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| Wheel diameter | 40 in (1,016 mm) |
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| Wheelbase | 48 ft 7 in (14.8 m) |
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| Length | 60 ft 8.5 in (18.5 m) |
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| Fuel capacity | 1,200 or 2,400 US gal (4,500 or 9,100 l; 1,000 or 2,000 imp gal) |
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| Lubricant cap. | 200 US gal (757 L) |
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| Sandbox cap. | 50 cu ft (1.4 m3) |
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| Prime mover | EMD 567C |
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| Engine type | V16 diesel |
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| Boiler | Vapor-Clarkson Steam Boiler OK4625 |
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| Cylinders | 16 |
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| Performance figures |
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| Power output | 1,750 hp (1.30 MW) |
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The Southern Pacific Class DF-120 was a class of 32 EMD SD9 diesel locomotives that were built by General Motors Electro-Motive Division (EMD) for the Southern Pacific Transportation Company in 1954.