While Gumby's out for his dental appointment, Denali accidentally smashes his prized model train. In true wacky sitcom tradition, Prickle and Pokey have to replace it before he gets back. While perusing the trains in Toyland, they're given a hard sell by a sentient engine who offers them a free ride. They shrink themselves down and hop in, rather pleased to find that the train can take them instantly to wherever they want to go. However, the train never stops, so they have to pass it up. Fortunately enough, a train just like the one they're looking for shows up when they get back to Toyland, so the cartoon can end now.