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An Arlesdale Adventure is the twelfth episode of the second season.


One day, Rex is given the job of collecting wool from the farmers along the line. One his way to Arlesburgh West with the wool, he gets switched onto an old line that leads to an old, boarded up tunnel shared by the North Western and Arlesdale Railways.

When he gets to Arlesburgh West, Duck explains that the tunnel is a tunnel to another Island, where they mine gemstones. Rex thinks they should reopen the tunnel. Fergus Duncan overhears and agrees with Rex, so they do just that.

Later that day, Duck and Rex become the first engines to go through the newly reopened tunnel.




  • This episode marks the first appearance of Garnet, Amethyst, Lapis, Topaz, and Bismuth, as well as the first appearance of Crystal Island and the Crystal Island Tunnel.
  • The twenty-first season episode, Useful Railway and likewise the Railway Series story of the same name is referenced.
  • This is the first episode released in 2021.