- Name: Spencer.
- Class: LNER A4 Pacific.
- Designer: Sir Nigel Gresley.
- Builder: LNER Doncaster Works.
- Arrived on Sodor: 2003.
- Gender: Male
Spencer is a silver tender engine and is Gordon's English cousin
During his first visit to Sodor, Spencer took the Duke and Duchess of Boxford on a trip around the Island of Sodor. Gordon was jealous when the other engines declared him, the fastest engine in the world. He advised Spencer to take only plenty of water, but he ignored Gordon's warning he was leaving Gordon to feel hurt and very sad. Spencer's pride caused him trouble when he ran out of water on Gordon's Hill. Gordon had to come to the rescue and pulled Spencer to the Duke and Duchess of Boxford's party. Spencer was embarrassed when Sir Topham Hatt declared Gordon the fastest engine on the Island of Sodor.
Spencer is based on a Gresley LNER Class A4 pacific. Mallard is also a member of the class