Glue these onto the sides of the carton for wheels. Use markers to add windows and doors to the train. Little red caboose behind the train, train, Smoke-stack on his back, Going down the track, Little red caboose behind the train, train. And then it runs right back. Now its going back.
Child goes back, etc.
Everywhere it goes. Children move around the room at random. This is a choo-choo train, Chugging down the track. Now it's going forward. And now it's going back.