The OP800 was a lightweight streamlined railcar built by the St. Louis Car Company in 1939. Fairbanks-Morse supplied the 800 hp five-cylinder 8 x 10 opposed piston engine prime mover. The units were configured in a highly-unusual 2-A1A wheel arrangement (later converted to 3-A1A) mounted atop a pair of road trucks and equipped with a front swing coupler pilot.
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