Diesel is a black Diesel.
- Season 1 - Crossed Lines (cameo)
- Season 3 - Domeless Engines (cameo) and Thomas and the Evil Diesel
- Season 4 - Pop Goes the Diesel, A Blast from the Past, Light Work (cameo), Dirty Work, and Diesel's Big Idea
- Season 7 - A Close Shave (does not speak)
- Season 9 - Limits, Tolerance, Old Tricks, and Little Engines
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