Thompson is a large green express engine who runs the London to Edinburgh service on the mainland. He is a fan-made character created by Thomas1Edward2Henry3.
Thompson was built between 1935 and 1938, being designed by Sir Nigel Gresley. He pulled fast express trains from London to Edinburgh and became friends with Donald and Douglas, whom he would converse with whilst waiting at the station. In 1959, when the twins were to be sent away, Thompson was very sympathetic and unintentionally gave Douglas the idea to "lose" their identities.
It is unknown what happened to Thompson after the decline of steam, given that his basis was withdrawn from service between 1962 and 1966, it can be assumed that he has either been scrapped or has been preserved.
A green LNER A4 Pacific from the download station was used for Thompson. James' face was photo-edited in.