Mavis is a female Diesel Engine who works for the Quarry company
Appearences
- Season 1 - Mavis and the Lorry and Fire Engine (mentioned)
- Season 2 - Toby's Megatrain (does not speak)
- Season 4 - Light Work (cameo) and Diesel's Big Idea (does not speak)
- Season 5 - Rusty to the Rescue (cameo)
- Season 6 - Oliver in Charge and Resource and Sagacity (cameo)
- Season 7 - Mountain Engine (cameo)
- Season 9 - Old Tricks (does not speak)