Editing EMD E9 (section)

==Engine and powertrain==
The E9 uses twin 12 cylinder 567C engines developing a total of {{convert|2,400|hp|kW|abbr=on}} at 800 [[Revolutions per minute|rpm]]. Designed specifically for railroad locomotives, this [[Roots-type supercharger|Roots-blown]], mechanically aspirated 2-stroke 45-degree V-type, with an {{convert|8+1/2|by|10|in|mm|0|abbr=on}}, [[Bore (engine)|bore]] by [[Stroke (engine)|stroke]], giving {{convert|567|cuin|L}} displacement per cylinder, remained in production until 1966. Two DC generators, one per engine, provide power to four motors, two on each truck, in an A1A-A1A arrangement. This truck design was used on all E units and on MP 7100 and CB&Q 9908 power cars. EMD has built all of its major components since 1939.{{sfn|Pinkepank|1973|pp=13, 26, 106, 124}}{{sfn|Ross|2003|pp=273–274}}