Callan Castle, also known as, Castle Loch, the Scottish Castle and Lord Callan's Castle, is a Sodor landmark and castle situated east of Peel Godred on the Misty Valley Branch Line. Lord Callan lives here.
It was first seen in the seventh season where it was reopened to the public. It has become a popular tourist attraction and appeared often until the eleventh season. It returned to the series in CGI in the fifteenth season episode, Spencer the Grand and has made several appearances since. A causeway crossing Black Loch was also seen at the castle in the seventh season.
- According to concept art for Bad Day at Castle Loch, the castle is loosely referenced from Glamis Castle in Scotland.
- Lord Callan flies the Scottish flag on days of ceremony.
- The model of the castle is on display at Drayton Manor.
- During the eleventh season, part of the Knapford set was used alongside the castle as filming of The Great Discovery to save cost instead of rebuilding it.