General Motors Electro-Motive Division (EMD) built 4,112 GP9 locomotives between January 1954 and August 1963.
The four-axle diesel-electric locomotive generated 1,750 horsepower. An EMD 567C sixteen-cylinder engine provided the power.
EMD also built GP9 locomotives without control cabs. Those were classified as GP9B locomotives.
EMD built a majority of the engines – 3,441 – for American railroads, including the Atchison, Topeka and Santa Fe Railway, the Central of Georgia Railway, the Central Railroad of New Jersey, the Georgia Railroad and the Illinois Central Railroad.
Locomotive Guide