Chuggington Season 1 Episode 8 Wilson Gets A Wash ( Air Date 2008-12-03 ) Genre Animation, Kids category. Overview "The trainees are playing hide-and-seek - and everyone has to admit that Wilson is the best hidey-chugger ever! The trainees' game is interrupted for a lesson: learning how to do different emergency stops with mud, leaves and water on the rails. Wilson is in heaven, as he likes nothing better than getting dirty!".