Children's animation set in Chuggington, a special place where all the trains talk, think and don't need drivers. Ride along with young trainees Koko, Wilson and Brewster as they embark on new adventures. Dunbar has a new training device, a voice-operated storm simulator tunnel, which simulates wind, rain and fog. When Dunbar is called away on an emergency, Wilson messes with the controls and the storm maker unleashes a violent storm.