Harrisburg Subdivision
At Arsenal Interlocking, on the west side of the Schuylkill, a branch runs southwest alongside Amtrak's Northeast Corridor to a junction with the Philadelphia Subdivision near Lindbergh Boulevard.The main line heads north from Arsenal, rises onto the elevated structure, and crosses to the west side of the Northeast Corridor.[6] The rest of the line, south and east to Greenwich Yard, opened in 1900 as the Schuylkill River Branch Extension to serve League Island.[7] The part of the Harrisburg Subdivision north of Zoo was built by the Junction Railroad and opened in 1863, connecting to what was then the main line of the Philadelphia and Reading Rail Road at Belmont.[10] The West Philadelphia Elevated, completed in 1904, was built by the PRR as a separate freight route through the 30th Street Station area between Arsenal and Zoo Interlockings.