Percy is the youngest engine in the team on the Fat Controller's railway line.
He is very cheerful and happy little engine. His job is to puff around the yard sorting out the trucks.
Percy shares his shed with five other engines. They are:
| Thomas | (Engine Number 1) |
| Edward | (Engine Number 2) |
| Henry | (Engine Number 3) |
| Gordon | (Engine Number 4) |
| James | (Engine Number 5) |
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