- "You should hear them in the workshop. You have to wheesh loudly to be heard."
- ―Percy, Trouble in the Shed, first season
The Workshop was a shed on the Mainland, where engines, old and new, were built/repaired and stored until they could be bought by railways or other industrial workplaces. One time, the Fat Controller visited the workshop with hopes of finding a tank engine. He looked at them all until he saw a green saddle tank and when the engine confirmed he was willing to work hard, the Fat Controller bought him and named him Percy.
- In the television series, the other engines shown in the workshop are really Edward, Henry, Gordon, James and Märklin covered under tarpaulins.