Harold is a rescue helicopter who patrols the island for danger. He thought railways were not as good compared to air travel, but was proved wrong by Percy, who beat him in a race. He is owned by the Sodor Coastguard and lives in his hangar in Dryaw.
- Harold is based off of a Sikorsky S-55 Helicopter with added floatation devices.
- His nickname is "Whirlybird."