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