Happy Hook is a crane at the Sodor Dieselworks.
Happy Hook was old and had not been repaired for a long time; as a result, Dart complained about the crane frequently. Kevin was then brought to the Dieselworks to do the jobs that Happy Hook could not, and enjoyed playing with it. When the Dieselworks was rebuilt, Happy Hook was restored.
Happy Hook's cab is painted orange and his tower and crane arm is painted grey.
- Season 16 - Bust My Buffers!
- Season 17 - The Missing Christmas Decorations and Away From the Sea
- Season 18 - Disappearing Diesels
- Season 19 - Henry Spots Trouble, Wild Water Rescue and Diesel's Ghostly Christmas
- Wooden Railway
- Mega Bloks (discontinued)