The Tower Windmill is located on the Loop Line between Elsbridge and Elizabeth's Shed. Between the fifth and sixth series, its original sails - more similar to those of the Post Mill - were replaced by the set which it carries today. The Tower Mill has appeared in the opening credits from the eighth to the eighteenth series. Due to possible time constraints, starting with Sodor's Legend of the Lost Treasure, the Tower Mill has seemingly replaced the Classic Windmill on Thomas' Branch Line for the time being. The Tower Mill also once appeared in an unknown location in Stepney Gets Lost.