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Broad Street Subway Line : ウィキペディア英語版
Broad Street Line

The Broad Street Line (BSL) (also known as the Broad Street Subway (BSS), Orange Line, or Broad Line) is a rapid transit line owned by the City of Philadelphia and operated by the Southeastern Pennsylvania Transportation Authority (SEPTA) that runs from Fern Rock Transportation Center in North Philadelphia, Pennsylvania to Pattison Avenue in South Philadelphia. The latter station provides access to the stadiums and arenas for the city's major professional sports teams, about a quarter mile away. It is named for Broad Street, the street under which it 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 AT&T Station (Pattison Station). The line and its trains are owned by the City of Philadelphia and were leased to SEPTA in 1968〔(Student Voices: Phila. threatens to seize subways from SEPTA )
〕 after it assumed operation of the city transit systems.〔(SEPTA history )〕 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; 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.〔(Stations of the Broad Street Subway )〕
Although the Broad Street Line was originally planned in the 1920s to be a 4-track facility for its entire length (Fern Rock portal to Snyder), the tunnel was built with provision for 4 tracks only from the portal to just north of Lombard-South. At the time of opening, the outer 2 tracks were built along this length, whereas the inner 2 express tracks were built only in two sections, from the Fern Rock portal/shops to just south of Olney, and from Girard to their terminus just north of Lombard South. To close the gaps, the two inner express tracks were laid from Erie to Girard in 1959, and again from Olney to Erie in 1991.
From Lombard-South station south to Snyder, the tunnel was constructed differently – only the eastern half of the line was built. The track currently used for southbound trains is actually the northbound express track. The extension to AT&T Station in 1973 continued this arrangement. Space exists under the western half of Broad Street for the construction of the western half of the tunnel, which would include the remaining 2 tracks and additional island platforms for southbound local and express trains. The resulting infrastructure would match the configuration built in the northern half of the line.
Provisions for flying junctions exist in the tunnels at three locations: north of Olney station, north of Erie station, and between Tasker-Morris and Snyder stations. These were to connect to planned but never built extensions to the north, northeast, northwest and southwest. Tracks were laid in the upper levels of the flying junctions north of Olney and Erie; these have been used over the years to store out-of-service trains and as layover points for express and Ridge Spur trains.
The AT&T Station contains a lower level platform, built to accommodate additional trains for large crowds at sporting events. Seldom used in recent years, these tracks are most often used to store rolling stock and work trains. Two of the Broad Street Subway system's stations have been closed: Spring Garden Station (closed in 1991) on the Ridge Avenue Spur Line and Franklin Square Station on the Former Bridge Line now called PATCO HIGH SPEED LINE (closed in 1953 and later opened in 1976 for Bi-Centennial and then closed again in 1979).
The Broad Street Line is one of only two rapid transit lines in the United States outside of New York City to use separate local and express tracks for a significant length, the other being Chicago's North Side Main Line from Armitage north, used by Purple Line express trains.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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