The West Philadelphia Elevated, also known as the High Line or Philadelphia High Line, is a railroad viaduct in the western part of Philadelphia, Pennsylvania. The 8,140-foot (2,480 m) structure spans the railway lines of 30th Street Station, parallel to the main track of the station, in a north-south direction. The 1,045-foot (319 m) long approach made of brick arches is the longest brick bridge and probably even the longest brick building in the United States. The viaduct was built in 1903 by the Pennsylvania Railroad (PRR) and is now part of the Harrisburg Subdivision of CSX Transportation.