The Arlesdale Castle is a small ruined castle located on Toby's Branch Line, the Cliff Side Track and the Arlesdale Lake and Mountains Line is located nearby.

The castle only appeared in the first and third seasons, it also appeared in a few music videos. After the first season, the castle's model was recycled and used for the Suddery Castle in the second season, and was later on used as Arlesdale castle back again for the third season.