Union Station (or Pennsylvania Station, commonly called Penn Station by locals) is a historic train station at Grant Street and Liberty Avenue in Pittsburgh, Pennsylvania. south of the Allegheny River, in the United States. It was one ofseveral passenger rail stations that served Pittsburgh during the 20th century (other stations included the Pittsburgh & Lake Erie Railroad Station, the Baltimore and Ohio Station, and Wabash Pittsburgh Terminal), and it is the only surviving station in active use.