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 equipment. Specifically, this bulletin is for the American Flyer Locomotive 343 Manual.
The American Flyer Engine 343 was produced from 1953 to 1958 and was an 0-8-0 Switcher. A switcher 0-8-0 would have had 0 leading, 8 driving, and 0 trailing wheels. There were 6 models of the Switcher 0-8-0 produced by Gilbert.