Harold is a white helicopter.
- Plarail/Tomica World/Motor Road and Rail
- Small size, made for propellers to move or fly.
- Plarail/Motor Road and Rail (2005-2007)
- Magnetic base in Harold's Mail Delivery.
- TrackMaster (2007-2011)
- Larger size and longer with more details.
- Motorized Railway (2014)
- Larger size.
- TrackMaster (Revolution) (2015-present)
- Redesigned, more chunky.
- Plarail (2017)
- Shorter, rolling stock wheels, front and back couplings.
- Harold with station (included with Thomas Adventure Set, Talking Thomas and Harold Adventure Set, Thomas Holiday Set, Thomas Ultimate Set) (Plarail/Tomica World/Motor Road and Rail)
- Harold, Terence and Windmill Scenery Set (Plarail)
- Harold and Windmill Scenery Set (Motor Road and Rail)
- Harold's Mail Delivery (Plarail, Motor Road and Rail)
- Harold (included with Thomas at Tidmouth Sheds, Harold at the Hangar, Knapford Station Celebration, Sodor Friends Road and Rail Set) (TrackMaster [HiT Toy Company])
- Harold (included with Harold to the Rescue, Misty Island Discovery, R/C Thomas at Tidmouth Sheds, and Deluxe Sodor Adventure Set) (TrackMaster [Fisher-Price])
- Sodor Search and Rescue Set (Motorized Railway)
- Harold's Helipad (TrackMaster [Revolution]
- Sky-High Bridge Jump (TrackMaster [Revolution])