An EMD GP7 is a four-axle diesel-electric locomotive built by General Motors Electro-Motive Division between October 1949 and May 1954. Power was provided by an EMD 567B 16-cylinder engine which generated 1500 horsepower (1.1 MW). This locomotive type was offered both with and without control cabs; locomotives built without control cabs were called GP7B locomotives. The GP7B locomotives were built between March and April of 1953. 2,610 examples of this locomotive model were built for American railroads, 112 were built for Canadian railroads and 2 were built for Mexican railroads. Of the GP7B, 5 examples were built for the Atchison, Topeka and Santa Fe Railway. GP7s made popular the road switcher configuration of diesel locomotives, and EMD soon found themselves barely able to produce enough of these units to meet customer demand. Subsequently, locomotives in EMDs 'GP' series came to be nicknamed 'Geeps', and many can still be found in service today.