| EMD SD40 | 
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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 5 ft 3 in (1,600 mm), Brazil
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 | Driver dia. | 40 in (1,016 mm) diameter | 
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 | Length | 65 ft 8 in (20.02 m) over the coupler pulling faces;
65 feet 9+1⁄2 inches (20.053 m) on some units starting early 1968.
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 | Width | 10 ft 0 in (3.05 m) | 
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 | Height | 15 ft 5+1⁄4 in (4.71 m) | 
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 | Loco weight | 360,000 lb (160 t) | 
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 | Fuel capacity | 3,200 US gal (12,000 L; 2,700 imp gal) | 
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 | Lubricant cap. | 243 US gal (920 L; 202 imp gal) | 
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 | Coolant cap. | 295 US gal (1,120 L; 246 imp gal) | 
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 | Sandbox cap. | 56 cu ft (1.6 m3) | 
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 | Prime mover | EMD 16-645E3 | 
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 | Engine type | V16 diesel | 
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 | Aspiration | turbocharged | 
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 | Alternator | main : AR-10 auxiliary : D14
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 | Generator | (?) | 
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 | Traction motors | D-77 | 
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 | Cylinders | 16 | 
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 | Loco brake | Independent air\ optional: dynamic brakes
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 | Train brakes | Air, schedule 26-L | 
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| | Performance figures | 
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 | Maximum speed | 83 mph (134 km/h) | 
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 | Power output | 3,000 hp (2,240 kW) | 
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The EMD SD40 is a model of 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division between January 1966 and August 1972. 1,268 locomotives were built between 1966 and 1972. In 1972, an improved version with new electronics was developed and marketed as a new locomotive, the SD40-2.