Hawin Doorey Castle

Sodor Castle, also known as Castle Causeway, is an old, ruined castle that stands near the causeway on the Skarloey Railway. It was first seen in the fourth season but its name was unknown until the seventh season episode, Rheneas and the Roller Coaster named by Rheneas' driver. Since then, it had appeared in every season, except the Eighth, until the Twelfth.

The castle later returned in the eighteenth season episode, Duncan and the Grumpy Passenger.

Trivia

 * The mountain behind the castle and the pine trees next to it only appeared in Season 4 until they returned in Season 18. The castle also returned to its original Season 4 look.
 * In the ninth and eleventh seasons, the building used for the castle was the same one used for the Ruined Castle.