Flynn is a fire engine who can run on rails on road.
Flynn worked with Belle on the mainland before they came to Sodor. Belle suggested to the Fat Controller that Flynn be brought to Sodor to help her fight fires. Flynn had instantly become popular with the engines on Sodor. Later on, Flynn and Belle helped Percy save Thomas and Kevin from Den and Dart at the Sodor Dieselworks. Flynn also used his ladder to assist welders during the restoration of the Dieselworks.