As part of a Sticker Activity Book tie-in, the revelation of a lost crown of Sodor is owned by a former king, as the book's summary reveals.
The Earl of Sodor has come to visit the island, and he wants to reopen Ulfstead Castle. All the engines have a job to do, but poor old Stephen doesn't think he'll be able to help.
The Godred reference dates back to the Mountain Engines book in The Railway Series, where a Sudrian figure known as Godred MacHarold ruled the reigns of Sodor for a number of years as king.
In the story Bad Look-Out, Culdee tells a tale of Godred, a careless mountain engine who was named after MacHarold.
King of the Railway: The Movie premieres in the UK, US, Germany and Australia from this September while the Sticker Activity Book hits UK book shelves on September 2nd.