The EMD GP40-2 is a 4-axle diesel-electric locomotive built by General Motors Electro-Motive Division as part of its Dash 2 line between April 1972 and December 1986. The locomotive's power is provided by an EMD 645E3 16-cylinder engine which generates 3,000 horsepower (2.24 MW).

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Quick Facts Type and origin, Power type ...

EMD GP40-2
An EMD GP40-2 locomotive switches in the yard in Readville, Massachusetts.
Type and origin Power type Diesel-electric Builder General Motors Electro-Motive Division General Motors Diesel (GMD) Model GP40-2 Build date 1972–1986 Total produced 1,143
Specifications Configuration: ​  • AAR B-B  • UIC Bo'Bo' Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Wheel diameter 40 in (1.016 m) Wheelbase 43 ft (13.11 m) Length 59 ft 2 in (18.03 m) Width 10 ft 4 in (3.15 m) Height 15 ft 5 in (4.70 m) Loco weight 250,000 lb (113,398 kg) Prime mover EMD 16-645E3 Engine type V16 diesel Aspiration Turbocharged Cylinders 16
Performance figures Maximum speed 65 mph (105 km/h) Power output 3,000 hp (2.24 MW) Tractive effort 61,000 lbf (27,669 kgf)

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Standard GP40-2 production totaled 861 units, with 817 built for U.S. railroads, 44 for Mexican railroads. Furthermore, 279 GP40-2s were built by General Motors Diesel (GMD) between 1974 and 1976. In addition, three GP40P-2s, passenger versions of the GP40-2, were built in 1974. Total production of the GP40-2 and its variations totaled 1,143 units.^{[citation needed]}

With the 62:15 gearing (65-70 mph maximum) EMD rated the GP40-2 at 55,400 lb continuous tractive effort. Some had PF21 module that reduced the output below 23 mph, lowering continuous speed down to 11 mph.^{[citation needed]}

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GP40-2LW

GP40P-2

Union Pacific has rebuilt 129 of their GP40's and GP40-2's into GP40N's at their Jenk's shop. These units received a microprocessor control system to increase adhesion, control options, and extend the life of the locomotive.^[2][3]

• Sonora Baja California 2107 is now preserved in a Museum in Mexicali, MX ^{[citation needed]}

• List of GM-EMD locomotives
• List of GMD Locomotives