This was developed at the Gilbert Hall of Science in 1949. Helpful hints for train layouts.
American Flyer Instructions For Assembling Trains Booklet 1949 & Other Ephemera
1947 American Flyer Instructions, Suggestions & Helpful Hints Booklet
Lot of Lionel and American Flyer Instructions + 5 #26781 Trestles
Vtg Lionel / American Flyer Booklets For Assembling & Operating Trains/2 Sheets
GILBERT AMERICAN FLYER TRAINS for 1957 - color CATALOG - listing #10057
American Flyer Original Instructions For Worm Drive Diesel Locomotives M2866C