"No one, not even Sir Topham Hatt, knows where Percy really came from.
He's an 0-4-0 saddle-tank engine who has spent much of his time on Sodor
keeping Henry and Gordon in their places. Percy has worked hard and Sir
Topham Hatt rewarded him by asking him to help with the building of the
new harbor at Knapford. Now Percy helps Thomas with the goods traffic on
the branch line and in the yard at Ffarquhar."
"Percy is the junior member of the principal team of engines. He is a
happy little chap who's normally quite happy puffing around the yard with
no particular desire for adventure in the great world outside."