|This article is about Bill. You may be looking for Bill and Ben or Ben.|
Bill is a tank engine who works with his twin, Ben, in the clay pits near Brendam.
- 1992 (black wheels, nameplates and lining sticker details, flat topped funnel, flat magnets, staples, and undated wheels)
- 1992 (painted on nameplates and lining)
- 1992 (beveled funnel)
- 1994 (larger black arch, no staples)
- 1994 (round magnets, wheels dated)
- 1996 (smaller magnets, rounded funnel)
- 1997 (larger magnets, thicker wheels)
- 2002 (back ledge)
- 2002 (back ledge removed)
- The prototype 1992 Bill used James' face. His eyes looked towards his right instead of his left.
- All individual versions of Bill are identical to Ben, apart from their nameplates depicting their respective names and Bill's eyes looking towards his left.