Mavis is a young and feisty diesel who works at the Ffarquhar Quarry.
Mavis is high-spirited, often doing things without thinking of the consequences. Inexperience often leads this feisty young diesel into trouble, but she's smart and learns from her mistakes.
- 1993 (four wheels, flat magnets)
- 1994 (six wheels, shorter exhaust tube and compressor, round magnets)
- 1999 (thicker wheels)
- 2013 (CG style face, curved edges, longer magnet guards, released as Mavis at the Quarry)