Class 40 was built at the Vulcan Foundry in Newton-le-Meadows, Lancashire, England. Class 40 was sent to Sodor in 1962 to assist the engines with goods and express work toward the end of Stepney's visit, but he only insulted the other engines by saying they were out-of-date, should be scrapped and bragged about his modernity. He got his comeuppance when an inspector's bowler hat jammed in his air intake, causing him to break down and to become as sick as boiler sludge. He sulked in the shed while Duck and Stepney took the Express for him to Cronk. While everyone was fare-welling Stepney, a disgraced Class 40 crept away, leaving behind "a rather nasty smell of bad manners and a battered bowler hat".

Class 40 is snobbish and rude, believing that diesel engines are superior and should take over from steam engines.

Your lines will be in Episode 18: Stepney the Bluebell Engine. Your audition lines may be used for his dialogue.