| Diesel's Big Idea | |
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Diesel's Big Idea is the seventh episode of the fourth season.
Plot
Characters
- BoCo
- Diesel
- Donald and Douglas (Douglas does not speak)
- Oliver (does not speak)
- Bill and Ben (do not speak)
- Mavis (does not speak)
- Thomas (cameo)
- Edward (cameo)
- Henry (cameo)
- Gordon (cameo)
- James (cameo)
- Percy (cameo)
- Toby (cameo)
- Duck (cameo)
- Annie and Clarabel (cameo)
- The Spiteful Brakevan (cameo)
- Sir Topham Hatt (mentioned)
