The Broad Street Line (BSL), also known as the Broad Street subway (BSS), Orange Line, or Broad Line, is a subway line owned by the city of Philadelphia and operated by the Southeastern Pennsylvania Transportation Authority (SEPTA). The line runs primarily north-south from the Fern Rock Transportation Center in North Philadelphia through Center City Philadelphia to NRG station at Pattison Avenue in South Philadelphia; the latter station provides access to the stadiums and arenas for the city's major professional sports teams at the South Philadelphia Sports Complex, about a quarter mile away. It is named for Broad Street, under which the line runs for almost its entire length. The line, which is entirely underground except for the northern terminus at Fern Rock, has four tracks in a local/express configuration from Fern Rock to Walnut-Locust and two tracks from Lombard-South to the southern terminus at NRG station. It is one of only two rapid transit lines in the SEPTA system overall alongside the Market–Frankford Line, though Center City Philadelphia is also served by four stations of the PATCO Speedline rapid transit line which runs between downtown Philadelphia through Camden, New Jersey to Lindenwold, New Jersey. With about 115,000 boardings on an average weekday, it is the second busiest route in the SEPTA system. The line and its trains were leased to SEPTA in 1968 after it assumed operation of the city transit systems from the former Philadelphia Transportation Company (PTC). Broad Street Line subway cars bear both the SEPTA logo and the seal of the City of Philadelphia to reflect the split ownership-operation arrangement. History Service on the northern half of the Broad Street Line, between City Hall and Olney Avenue, opened on September 1, 1928. While the original subway tunnel had been finished to just north of the present-day Lombard-South station, service to the Walnut-Locust station did not begin until 1930, and the Lombard-South station entered service in 1932. Service from that point south to Snyder Avenue began on September 18, 1938. Service to a new park-and-ride station built next to the Fern Rock shops began in 1956, and the line was extended further south to Pattison Avenue in 1973 to serve the recently completed Sports Complex. The total cost of the original segment, "Olney Avenue to South Street," was stated at $102 million. Although the Broad Street Line was originally planned in the 1920s to be a 4-track facility