A Change is as Good as a Rest

CGI animation. Ernie, controller of International Underground, is always on hand to help his friends and to get passengers to their destinations safely. He is helped by trains Victoria, Bakerloo, Circle, Jubilee, the twins Hammersmith and City, and Ernie's friends Millie and Mr Rails. Brooklyn suggests that the trains swap lines for a change. However, none of the passengers know there's been a change and chaos ensues.