It was first seen in the seventh series where it was reopened to the public. It has become a popular tourist attraction and appeared often until the eleventh series. It returned to the series in CGI in the fifteenth series episode Spencer the Grand and has made several appearances since. A causeway crossing Black Loch was also seen at the castle in the seventh series. There is also a stadium on the grounds according to the book, Railway Race Day.
- 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 series, part of the Knapford set was used alongside the castle as filming of The Great Discovery to save cost instead of rebuilding it.