Duke is a Brown Narrow Gauge Tender Engine.
Duke was first Appeared in "Frank and the Trucks".
- Season 1: Frank and the Trucks
- Season 4: Duke Takes Control
- Season 8: The Faulty Coupling
- Season 9: Special Tunnel
- Season 10: A Crack in the Track and Tour de Sodor
- Season 11: Around the Railyard in 64 Seconds, The Great Western Way (cameo), Duncan in the Dumps, Just Duck's Luck (cameo) and Wooden Brakes
- Season 12: Scottish Blues (cameo) and Truckus Ruckus (cameo)
- Season 13: The Duke of Hazard
- Season 14: Freddie at the Ready
- Season 16: Paxman Pulls Through (cameo)
- Saving Pirate Ryan (cameo)