"Silly" Billy is an orange tank engine with prominent buck teeth.
When we first met Billy, he was naughty.
Billy is a Manning Wardle L Class 0-6-0ST. Charlie is another member of this class.
- Season 4: Duncan and the Passengers,
- Season 5: Boastful Billy
- Season 6: Officer Murdoch (does not speak)
- Season 7: Molly's Folly
- Season 11: Stepney and the Bluebell Branchline (cameo) and Station Situation
- Season 12: The Importance of Being Billy, Percy Gets a Promotion (does not speak) and If The Dome Fits (does not speak)
- Season 14: Millie's Castle Hassle (cameo),
- Season 15: Roundhouse Roulette