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 season.

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


  • Tidmouth Tunnel has had numerous modifications throughout the years:
    • Season 7:
      • The tunnels architecture changed.
      • The lake became significantly smaller.
  • The Castlelated Tunnel is a modified version of this tunnel.


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