The EMD E9 was a 2,400-horsepower (1,790 kW), A1A-A1A passenger train-hauling diesel locomotive built by General Motors' EMD between April 1954 and January 1964. 100 cab-equipped lead A units were produced, along with 44 cabless B units, all for service within the US. The E9 was the tenth and final model of EMD E-unit produced, and differed from the earlier E8 as built only by the newer engines and a different, flusher-fitting mounting for the headlight glass, the latter being the only externally visible difference. Since some E8s were fitted with this, it is not a reliable way to distinguish between the two.
The 2,400 hp (1,790 kW) was achieved with two 1,200 hp (895 kW), 2-stroke diesel V12 model 567C engines, each engine driving its own generator to power the traction motors.
According to one list, 42 of the 100(+44) survive. The Union Pacific Railroad rosters three, (951, 949, and 963B), which have been re-engined with single EMD 16-645E engines for commonality with other UP power and thus ease of maintenance.
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