Every story needs a slightly mean character to show people and kids how to deal with adversity. Diesel 10 is known as the mean conductor chasing around Thomas and his Friends. This is really an evolved piece of Thomas the train that still has kids and parents raving. As Thomas the Train stories evolve so do the characters. This one being one of the first to change some of the face of Thomas the Train is sure to add to any collection and be a part of history.