This is the service bulletin furnished by the A. C. Gilbert Co. to authorized service stations to aid them in the service and repair of American Flyer Locomotive 336 Union Pacific.
The American Flyer Locomotive 372 was produced from 1955 to 1957. American Flyer had three basic types of diesel trucks. Diesel naming convention moved away from the steam Whyte system and focused on Axels instead of wheels. GP7 trucks with two powered axles, PA/PB trucks with simulated three powered axles (also used on the EP-5 Electric style locomotive) and the Baldwin diesel trucks had two powered axles.