 When Big Jet arrives at a train party and steals the trains  party supplies, the Little Einsteins and Loco, the littlest train in the Train Junction, volunteer to save the party. The team and Loco head into the Wild West on a mission that takes them through snake- and scorpion-infested tunnels, musical roller coasters, and the Grand Canyon! When the team wins the final showdown with Big Jet, they celebrate with Loco, the hero of Train Junction!