A Caged Hall. Great Western Railway “Hall” class 4-6-0 locomotive No. 5972 Olton Hall on display in its more famous guise as “Hogwarts Castle” at the Warner Brothers Harry Potter Studio tour outside of London England. The locomotive was used in filming the 8 Harry Potter movies while it was “in ticket” and able to steam. It’s now on loan to Warner Brothers for the studio tour while it awaits a future restoration and return to steam.