Percy is a cheeky saddletank who was brought to Sodor to help run the railway during the big engines' strikes. when the big engines were on strike, Percy leaves the workshop where he lived with more engines. Percy helped to run the branch line while Thomas and Edward ran the Main Line, Percy was allowed to stay at the railway when the big engines learned the lesson. but Percy annoyed the big engines at first. he is cheeky and he plays jokes on Gordon and James, Percy was sent to Thomas' Branch line to help build the harbour and has stayed there ever since as a goods engine.