Koko (voiced by Imogen Bailey in the UK and Brigid Harrington in the US), is an electric engine, modelled on the bullet train. She is green and purple, and was built for high speed, being one of the fastest Chuggers in Chuggington. She loves to explore and have adventures, and to challenge her friends to a dare or a race. Although she can get into mischief, she always means well and knows when to apologise.
