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4-axle diesel-electric locomotive built by General Motors' Electro-Motive Division
The GP40 is 3 feet (0.914 m) longer than its EMD 567D3A-engined predecessor, the GP35, and distinguished visually by its three 48-inch radiator fans at the rear of the long hood, while the GP35 has two large fans and a smaller one in between. It was built on a 55 ft (16.76 m) frame; the GP35 was built on a 52 ft (15.85 m) frame - as was the GP7, 9, 18, and 30. The difference in length can be seen in the GP40's ten handrail stanchions compared to the GP35's nine.
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.
The GP22ECO is a locomotive built from recycled GP40/GP40-2 parts. The frame, trucks, and carbody are refurbished, while the 16-645 engine is replaced with a new 8-710-ECO engine. The electrical system is replaced with a modern microprocessor-based system. Horsepower is reduced to 2,150 due to the smaller engine.
Penn Central #3118 (ex-Conrail, ex-DRGW) was purchased by the Austin Steam Train Association in 2024. The locomotive is currently in its Horizon Rail livery and numbered 3134. The engine has also been updated with a microprocessor, making it a GP40-3.
A Guilford Rail System GP40 in Wells, Maine.
A Dakota, Minnesota and Eastern Railroad GP40 running long hood forward
A GP40 of Union Pacific Railroad heritage, now owned by Webb Asset Management
A GP40 owned by Helm Locomotive Leasing
A GP40 owned by Larry's Truck & Electric (LTEX)
Ex-Burlington Northern GP40M no. 3004 at Lincoln, Nebraska in 2011
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