Mavis (a.k.a. Mavis the Quarry Diesel Engine) was a woman that was Bio-Fused into BR class 04 tram diesel.
Mavis' past life is unknown prior to Bio-Fusion.
At one point, she was Bio-Fused into a BR Class 04 tram diesel by Sodor Research Ltd; however when the railway staff fueled Mavis up, her internal organs and her face were caught on fire and she was soon dead.
Shed 17 Universe
- Thomas The Tank Engine: Shed 17 (does not speak)
- Thomas The Tank Engine: Project G-1 (drawing cameo)
- Roly's Christmas Special (cameo)
- Mavis is one of the only characters that Pauls Vids hasn't made a 3D model of, so her Bachmann model was used instead.
- Mavis was the first diesel engine to be Bio-Fused locomotive used on railways.
- Mavis is the first engine to die in Shed 17.