So, just what do those letters in older locomotive destinations mean?
F: As in the F Unit (FT, F5, F3, etc).
Fourteen Hundred (horsepower) for the first FT. The real hp rating was 1, 350, but EMD rounded up. Some claim it stands for "freight. "
E: As in the E Unit (EA, E8, etc).
Eighteen Hundred (horsepower) for the first EA passenger unit.
General Purpose (EMD).
Special Duty (EMD)
Branch Line (EMD)
Road Switcher (EMD & ALCo)
Switcher (EMD & Baldwin).
Consolidated Line (Fairbanks-Morse)
One modern locomotive.
ES44AC: General Electric product.
Evolution Series /4,400 horsepower / AC traction.