Children's animation. Chuggington is a special place where the trains are known as chuggers. They talk, think for themselves and don't need drivers. Ride along with young trainees Koko, Wilson and Brewster as they embark on new adventures, make new discoveries and learn the true meaning of friendship. Brewster delivers some feed to the safari park and hurries back to practise picking up mail sacks, unaware that he has a naughty monkey stowaway on board.