Bill and Ben are the twin tank engines.


Season 2 - Scrambled Eggs

Seaspn 3 - Domeless Engines (cameo) and The Diseasel

Season 4 - Light Work and Diesel's Big Idea (does not speak)

Season 6 - Oliver in Charge

Season 8 - Edward's Exploit (do not speak)

Season 9 - Little Engines

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