Shout out to Kaylee Zheng whose clinic was the initial data for this cheat sheet!
EMD Model DesignationExample: SD 70 AC |
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Unit Type | Locomotive Series | Improvement Series | Options/Modifiers |
F = Cowl/Monocogue Unit SW = Switcher MP = Multi Purpose Switcher GP = General Purpose (4 axle) SD = Special Duty (6 axle) |
If last digit is 9, then 12 cylinder prime mover; otherwise 16 cylinder. Exception: T4 locos are 12 cylinders always |
(blank) = base version -1 = EMD reman. program (late 1960s) -2 EMD reliability improvement series |
A = Special Custom Builds |
GE Model DesignationExample: Dash9 44 C W |
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Locomotive Series | Locomotive HO x 100 | Wheel Arrangement per Truck | Options/Modifiers |
U = Universal |
For AC series, full HP is written out, although, conventional 2 digit HP indicator is also used interchangeably |
C = Cowl Unit |
GE DASH 9-44CW | GE AC44C6M | GE ES44AC GEVO | GE ET44AC Tier 4 GEVO | EMD SD70ACe | EMD/NS SD60E | |
RIght Side View | ![]() |
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Left Side View | ![]() |
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Top View | ![]() |
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Front Quarter View | ![]() |
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Rear Quarter View | ![]() |
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