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Tidmouth Tunnel, also known as the Castle Tunnel, is a tunnel on Duck's Branch Line between Tidmouth and Tidmouth Hault.

It first appeared in the third series and made numerous appearances until the ninth. The architectural style changed in the later seasons. Although never mentioned by name in an episode, it was first named in an eighth series learning segment. It returned in Tale of the Brave in the same architectural style as the third series and later appeared in The Adventure Begins and has made infrequent appearances since.

In the television series, this is where James once tried smoking bees off his boiler.



  • Tidmouth Tunnel has had numerous modifications throughout the years:
    • Series 7:
      • The tunnel's architecture changed.
      • The lake became significantly smaller.
    • Series 9:
      • The lake beside the track disappeared and was replaced with grass.
    • Tale of the Brave:
      • The tunnel's architecture returned to its original design.
      • The lake returned to its size in the third season.
  • The number of tracks leading through the tunnel changes between one to three tracks on many occasions. Since Tale of the Brave, there have been two tracks.
  • The Castellated Tunnel is a modified version of this tunnel.