GENUINE PARTS
Genuine Parts supplied by EMD, G.E. or ALCO Distributors

ORIGINAL EQUIPMENT PARTS (OEM)
Original equipment parts supplied by the manufacturer
swho are past or present suppliers to the locomotive builder
of the parts used for the original construction of the locomotive
or engine.

REPLACEMENT PARTS
Replacement parts manufacturers of the parts supplied
to American Class One Railways.
These manufacturers are approved vendors to the Class
One Railway and must pass strict quality control measures
to gain the Class One Railways approval.