The EMD E9 was a , A1A-A1A passenger train-hauling diesel locomotive built by General Motors' Electro-Motive Division of La Grange, Illinois between April 1954 and January 1964. 100 cab-equipped lead A units were produced, along with 44 cabless booster B units. All were for service within the United States. 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.
Many E9s survive today. According to Andrew Toppan's list of March 5, 1997, 42 survive. Four E9s are owned by the Illinois Railway Museum, in Union, Illinois. A number of railroads keep a small number in service for hauling inspection specials, charter passenger trains, investor tours, and the like. 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.
Amtrak, founded in 1971, bought scores of E9s from the Union Pacific, Burlington Northern, Seaboard Coast Line, and Penn Central. Amtrak used the E9s throughout their nationwide network until the late 1970s, and converted large numbers of the cab-less E9-B units for dedicated service as steam generator and head end power cars.
| Road numbers|
| Road numbers|
|Baltimore and Ohio Railroad|| || || || |
|Chicago, Burlington and Quincy Railroad|| || || |
|Chicago and Eastern Illinois Railroad|| || || || ||to Missouri Pacific Railroad|
|Chicago, Milwaukee, St. Paul and Pacific Railroad|| || || || ||Built to Union Pacific specifications for City train service. Renumbered 30ABC–35ABC|
| || || ||Built with Head end power for commuter service|
|Florida East Coast Railway|| || || || ||to Illinois Central|
|Illinois Central Railroad|| || || || |
|Kansas City Southern Railway|| || || || ||Model E9m|
|Seaboard Air Line Railroad|| || || || |
|Southern Pacific Railroad|| || || || |
|Union Pacific Railroad|| || || |
MK's move into OEM. (Morrison Knudsen's entrance into the original equipment manufacturing market for locomotives)
Jul 01, 1993; Morrison Knudsen, best known as a remanufacturer of locomotives and passenger equipment, is making a bid to establish itself as a...