William and Benjamin nicknamed Bill and Ben are tank engine twins who work for the Sodor China Clay Works.
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Bill and Ben both have brown nameplates with yellow writing, "SCC" written on both sides in yellow and "Brendam Bay" on the front of their saddle tanks.
- In the French version of Keekre24's series, Bill and Ben are called Guillame and Benjóin.
- Season 1: Murdoch and the Express
- Season 2: Twin Trouble, Disaster on Sodor and The Flying Scotsman Departs (do not speak)
- Season 4: Rosie's Wild Ride and Naughty Engines
- Season 5: The Express Turkey
- Season 7: Molly's Folly (cameo) and Stanley, Whiff, and The Troublesome Dumptrucks
- Season 8: The New Controller (cameo)
- Season 9: Hankenstein (cameo) and Mavis and the Sleepy Engines
- Season 11: Stepney and the Bluebell Branchline (Bill only), Big City Rumor, Spencer Goes Too Far (Bill only) and Trembling Trevor (mentioned)
- Season 12: Greetings, Montague! (do not speak), The Mavis Matrix, Henry's Handcar Havoc (Ben does not speak), Rheneas and the Risky Rendezvous (Bill or Ben cameo) The Mystery Train, Sidney the Renegade (mentioned), and Vicarstown Takedown (mentioned)
- Season 13: It's Good To Be Belle (Bill only; cameo), Victor's Loco Motives (Ben only), Rust or Bust, Toad Gets Towed (cameo) and Hector and Logan's Hot Pursuit (Bill speaks; Ben does not speak)
- Season 14: Quarry Quest, Hiro and the Heat Wave (Bill only; cameo), Cabless Companions (Ben only),
- Season 15: Roundhouse Roulette (do not speak)