|Percy the Small Engine|
|Class: GWR Avonside 0-4-0ST|
|Designer: Avonside Engine Company|
|Builder: Avonside Engine Company|
|Built: Circa 1900|
|Arrived on Sodor: Sometime between 1925 and 1935|
Percy is a cheeky green saddletank engine who was brought to Sodor to help run the railway during the big engines' strike. His favourite job is to deliver the Mail Train. He works on Thomas' Branch Line as a goods engine.
Percy is the No. 6 green engine and is the junior member of The Fat Controller's railway. He is Thomas' best friend and his favourite job is delivering the mail.