Bill and Ben are 2 Yellow Tank Engine Twins who work for The Sodor China Clay Works.
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 dub version of Keekre24's series, Bill and Ben are called Guillame and Benjóin.
- in the Polish dub version of the real Thomas the tank engine tv series, Bill and Ben is referred to as a females.
- Season 1: Wilbert, Frank, and the Milk (mentioned) and 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 10: Scruff and S.C. Ruffey and Coal Crisis (cameo)
- 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), Scottish Blues (do not speak), The Importance of Being Billy (cameo), 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) and Cabless Companions (Ben only)
- Season 15: Roundhouse Roulette (do not speak), The Crosby Coalition and The Island of Misifts Engines (cameo)
- Season 16: Marion Had a Little Lamb