GP18 Diesel Locomotive

Prototype Information

EMD built the GP18 between 1959 and 1963 as the final first-generation Geep. This model bridged the gap between the famous GP9 and the turbocharged GP20. It used a 16-cylinder 567D1 engine to produce 1,800 horsepower. EMD chose a Roots-blown system for this model because many railroads preferred its reliability over new turbocharger technology. This locomotive marked a major design shift by offering a low-profile short hood as a standard option. Engineers enjoyed much better visibility with this lower nose. You can spot a GP18 by its flat metal radiator shutters, which replaced the older chicken wire mesh style.

Railroads bought only 405 units because most had already replaced their steam fleets. The Missouri Pacific became the largest customer, though the engine also served the Norfolk & Western and Illinois Central. Its simple, rugged design allowed it to outlast many newer, more complex locomotives. Many GP18s transitioned to short-line railroads like the East Penn and Florida Central after leaving major lines. Preservationists have saved several units for history, including Nickel Plate Road #514.