Bill and Ben are yellow tank engine twins that work at the Clay Pits.
Bill and Ben are based on the Bagnall 0-4-0STs "Alfred" and "Judy" of Par, Cornwall, who are both preserved and in working order at the Bodmin and Wenford Railway.
Bill and Ben are painted yellow with red lining.They both have brown nameplates with yellow writing, "SCC" written on both sides in yellow and "Brendam Bay" on the front of their saddle tanks.
- Dockyard Tales
- Memories, Sweet, Sweet Memories
- Quadruplets (mentioned)
- Quads, Quarries, and Quarrels
- The Search For The Controllers Part 1 (do not speak)
- The Search For The Controllers Part 2 (do not speak)