|The Dark Green Tank Engine|
- Designer: Avonside Engine Company
- Builder: Avonside Engine Company
- Configuration: 0-4-0ST
The dark green tank engine is a saddle tank engine who resembles Percy. He only appeared in the Railway Series pop-up book, James the Red Engine and the Troublesome Trucks.
After shunting James' trucks, he teased the red engine about the incident when James needed bootlaces to mend a hole in his coaches. It is unknown what happened to the engine afterwards.
He is painted dark green.