Tidmouth Bay is a station and castle located on Toby's Branch Line near the old mine. It only appeared in the fifth and sixth seasons and in stock footage in the seventh season. The castle was found by Toby and Sir Topham Hatt after his grandchildren showed him a map featuring the castle.
- Season 5 - Toby's Discovery and Make Someone Happy
- Season 6 - It's Only Snow (mentioned on poster), Scaredy Engines, Percy and the Haunted Mine, Percy's Chocolate Crunch, Thomas, Percy and the Squeak and Edward the Very Useful Engine
- Season 7 - Edward's Brass Band (stock footage), Bulgy Rides Again (stock footage) and Best Dressed Engine (stock footage)
- King of the Railway (original concept)