Harold is a helicopter who is part of the Sodor Search and Rescue team. He has a friendly rivalry between Percy and sometimes takes the Mail.
Harold used to think railways were old and out-off-date until Percy managed to beat him in a race. Once when Thomas' brakes had failed, Harold and an inspector chased him across the Island, until the inspector managed to board Thomas and successfully apply the brakes. Despite being full of himself sometimes, Harold always means well in the end.
- HO Scale
- Harold was the first aircraft to be produced by Bachmann, the second being Jeremy.