Gordon is a big express engine who lives on the Island of Sodor.
Gordon is extremely proud of his position as an express engine in Crotoonia and on Sodor. He is one of the fastest engines to work on Sodor. Because of this he is inclined to boast but he is also goodhearted, always willing to forgive and uses his superior strength to help smaller engines out of trouble.
Gordon's important position as the engine who pulls the Express has made him proud, pompous and self-important.
Gordon acts as a bully, particularly towards Edward, but following misadventures where Edward had to help him, Gordon had to acknowledge that despite being old, Edward is still a very useful engine. However, sometimes Gordon still doubts Edward is still reliable. He would soon stop belittling Edward after being tricked by Thomas; he learned his lesson and apologized to Edward saying that he promised not call him "old or unreliable anymore".
Sometimes, Gordon shows a kinder side and gives the younger engines advice, usually after he has had some mishap as a result of his foolhardiness. Some of his advice is not exactly helpful or honest, though, as James, Percy and Sir Handel have discovered.
Gordon is the experimental prototype for Sir Nigel Gresley's A1 Pacific design for the Great Northern Railway. Gordon was built at Doncaster Works in Yorkshire. Once the first batch of A1 Pacifics appeared in 1922 Gordon would have more than likely have been reclassified A1/1 - the '/1' indicating he is slightly different to the rest of the class.
Gordon is painted blue with red stripes and he has the number 4 painted yellow and boarded with red on his tender.
- Leo Jones once stated that he loosely based Gordon's Voice off of Comedian Brian Blessed.