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Thomas de Stoomlocomotief - Mavis (US George Carlin)
Seizoen: 3 - Aflevering: 114 / 92 - Eerst uitgezonden: 11 november 1991 - Episode ID: 858204
Mavis is a young diesel engine who is starting work at the quarry. Unfortunately her way of shunting is a lot different from Toby's and he gets annoyed. A bit of false encouragement from Diesel gets Mavis into trouble.