High Quality Content by WIKIPEDIA articles! The Westinghouse Air Brake Company General Office Building (Known locally as The Castle or Library Hall) in Wilmerding, Pennsylvania is a building from 1890. It was listed on the Pittsburgh History and Landmarks Foundation in 1975,National Register of Historic Places in 1987. Originally built as an office building for the Westinghouse Air Brake Company, it now houses The George Westinghouse Museum.