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Ulfstead Castle is the home of the Duke of Sodor. It is on loan to the Island Record Office at Suddery and the Duke lives on the outskirts of Ulfstead.

In the television series, the castle was owned by King Godred in the olden days. Now, the castle is the home of Sir Robert Norramby and was introduced in King of the Railway. It has rails, a lot of it dual-gauge, running through it and its own station. There is a mine beneath the castle and it also has its own crane. Millie works here and does a variety of jobs including helping the groundskeeper and taking tourists around the estate in an open-topped carriage. Stephen also lives here.

The castle has its own park area which is home to several deer including a deer that that Luke once befriended. The park area is tended to by a groundskeeper who has his own lodge on the castle's grounds.