Spencer is a large, silver, fast steam-engine that is very boastful saying he is the fastest engine on the Island of Sodor. He appears in 3353 Spencer and Sir Topham Hatt.
During his first visit to Sodor, Spencer took the Duke and Duchess of Boxford on a trip around Sodor, but ignored Gordon's warnings about taking on water and thus ran out - Spencer attributed the incident to a leaky tank. Upon his next visit, Spencer challenged Edward to a race and maintained a lead for the majority of the race, but vainly fell asleep while the Duke and Duchess stopped to take photos and narrowly lost to Edward after he got onto the summer-house branch line first.
Spencer has since developed a rivalry with Thomas, with the latter often trying to outshine Spencer - largely without success.
- Spencer and Gordon are the only two DUPLO Trains not to have side rods.