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. Now part of the Harrisburg Subdivision of CSX Transportation, the viaduct was built in 1903 by the Pennsylvania Railroad (PRR) to allow through freight trains to bypass rail yard, industrial sidings, and a passenger station.
The 8,140-foot (2,480 m) structure runs north-south, over and alongside tracks that serve today's 30th Street Station. Most of the structure is steel, but a 1,045-foot (319 m) section north of the station is made of brick arches; it is the country's longest brick bridge and probably its longest brick building.[citation needed]