The trainees are playing "Hidey chugger" in the Roundhouse Park when Koko comes across Hodge playing a chugnav game. Koko wants to beat Hodge's top score, she forgets about Wilson and Brewster and goes off to try and complete all the levels of the chugnav game. Old Puffer Pete has broken down, Vee asks Koko him back to the depot but the game distracts her and she forgets all about him.