The EMD F7 is a 1,500 horsepower diesel-electric locomotive built for North American rail service between February 1949 and December 1953 by the Electro-Motive Division of General Motors and, in Canada, by General Motors Diesel; it used a 16-cylinder two-stroke diesel engine with a Roots blower, weighed about 247,300 pounds and could run 65 to 102 miles per hour. A total of 2,393 A units and 1,463 B units were built, more F7s than all other F-unit models combined, making it by far the best-selling cab unit design of all time. Though marketed mainly for freight, the F7 proved versatile enough to pull prestigious passenger trains such as the Santa Fe Railway's Super Chief and El Capitan, and its reliability and economy of operation made it a dominant force on American railroads through the middle of the twentieth century.
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