Arry and Bert are Diesel twins. They are the teirtary antagonists of the show.


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Season 1 - Races (cameo), Paxton Helps Out, and The New Diesel Fuel (cameo)

Season 2 - Den and the Firefighter (cameo) and Off to the Scrapyards

Season 3 - The Tug (does not speak)

Season 4 - Henry and the Coal, Stanley and the Old Scrap (mentioned)

Season 5 - Mavis and the Late Night Track Repairs (does not speak)


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