Is anyone familiar with the American Flyer "Accessory Pack" # 121811? It came in a cardboard box (imprinted with the set number and engine and car numbers) and included the 21085 loco and tender, permanently attached, and a block of wood between engine cab and tender. Also included were All Aboard-boxed cars #s 24516, 24549, 24569, and 24533, and these were individually shrink wrapped. Last were a smoke accessory kit and some typical 1960s instructions.
My belief is that it was from around 1966 or so and was available to add to already-existing All-Aboard panel train sets.