Diesel (nicknamed Devious Diesel by the other engines) is a devious black diesel engine, and the main antagonist of Thomas the Tank Engine Tales. When he visits the island of Sodor, he likes to tell the steam engines that they will soon be scrapped. This always gets Diesel in trouble, and he has been sent away from Sodor many times. Diesel is oily, scheming, and his characteristic smirk is a sure sign that someone, somewhere is in for a bit of trouble.

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