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.
- The station shares the same design as Maithwaite station.
- Concept art for King of the Railway shows that Tidmouth Bay would have appeared as the railway station for Ulfstead Castle. This was never used in the final special for unknown reasons.