Duck The Really Useful Engine is a Potential Plotlines episode.
James and Diesel say rude things about Duck. But when James and Diesel pull trucks, James' regulator breaks down and Diesel's airtake splutters and James and Diesel get stuck on Gordon's Hill. Duck rescues them. The Fat Controller punishes James and Diesel for saying rude things about steam engines.
- Gordon (cameo)
- Donald & Douglas
- Oliver (does not speak)
- Emily (cameo)
- The Fat Controller
- First time, James and Diesel say rude things about steam engines.
- The narrator said that James and Diesel puff away, but Diesel is a diesel.
- When James and Diesel break down on Gordon's Hill, steam comes out of Diesel's wheels.