Zoo Junction is a junction on Amtrak's Northeast Corridor in Philadelphia, Pennsylvania where the Northeast Corridor meets the Keystone Corridor (ex-Pennsylvania Railroad main line). [1]
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Zoo Junction is a flying junction, where multiple tracks cross one another by bridges to avoid conflict with other trains. [1]
In 1870, the Pennsylvania Railroad built the Connecting Railway from Frankford Junction to Zoo to bypass congested street running in Philadelphia. [2] Instead of reaching the city directly from the north, the Connecting Railway turned west, crossed the Schuylkill River on the Connecting Railway Bridge (a stone arch viaduct) and then turned south to join the PRR's Main Line at Mantua Junction. Mantua was a wye junction controlled by three manual signal boxes; there was also an engine house and the massive 37th Street Yard in the center of the wye.
By 1888 the Mantua Junction was at capacity. In 1910 the PRR built two duck-under tunnels to allow trains to reach the Connecting Railway without blocking the Main Line and 37th Street Yard. The eastern 36th Street Tunnel also allowed grade-separated access to the Junction Railroad connecting to the Philadelphia and Reading Railway. Today, the tunnel only connects to the Northeast Corridor and is used by SEPTA, while the Junction Railroad now connects to the West Philadelphia Elevated as part of the CSX Harrisburg Subdivision. The western tunnel, called the New York-Pittsburgh Subway, allowed trains running from New York to Pittsburgh and west (such as the Broadway Limited) to bypass Broad Street station and a prolonged reverse move; such express trains would only stop in North Philadelphia. [3] In 1935, the interlocking reached its final form in conjunction with electrification and the construction of 30th Street Station and Suburban Station. Suburban commuter trains were routed to 30th Street's upper level towards Suburban, while intercity trains ran to the lower level.
In the crescent-shaped pocket between the junction and the river is the Philadelphia Zoo, which gave the interlocking its name. The former Zoological Garden station was located next to the interlocking to serve visitors to the Zoo.
The Northeast Corridor (NEC) is an electrified railroad line in the Northeast megalopolis of the United States. Owned primarily by Amtrak, it runs from Boston through Providence, New Haven, Bridgeport, Stamford, New York City, Trenton, Philadelphia, Wilmington and Baltimore to Washington, D.C. The NEC closely parallels Interstate 95 for most of its length, and is the busiest passenger rail line in the United States both by ridership and by service frequency as of 2013. The NEC carries more than 2,200 trains daily.
The Northeast Corridor Line is a commuter rail service operated by NJ Transit between the Trenton Transit Center and New York Penn Station on Amtrak's Northeast Corridor in the United States. The service is the successor to Pennsylvania Railroad commuter trains between Trenton and New York, and is NJ Transit's busiest commuter rail service. After arrival at New York Penn Station, some trains load passengers and return to New Jersey, while others continue east to Sunnyside Yard for storage. Most servicing is done at the Morrisville Yard, at the west end of the line. The Northeast Corridor Line is colored red on NJ Transit system maps and its symbol is the State House. The Princeton Branch is a shuttle service connecting to the line. Connecting SEPTA Trenton Line service between Philadelphia and Trenton is listed in the timetable.
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A flying junction or flyover is a railway junction at which one or more diverging or converging tracks in a multiple-track route cross other tracks on the route by bridge to avoid conflict with other train movements. A more technical term is "grade-separated junction". A burrowing junction or dive-under occurs where the diverging line passes below the main line.
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The Connecting Railway was a subsidiary of the Pennsylvania Railroad, incorporated to build a connection between the Philadelphia and Trenton Railroad and the PRR in the city of Philadelphia.
The Harrisburg Subdivision is a railroad line owned by CSX Transportation in the U.S. state of Pennsylvania. The line is located in the city of Philadelphia, connecting Greenwich Yard and the Philadelphia Subdivision with the Trenton Subdivision along a former Pennsylvania Railroad line. Much of the Harrisburg Subdivision is the High Line or West Philadelphia Elevated along 31st Street over the 30th Street Station area.
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) approach made of brick arches is the longest brick bridge and probably the longest brick building in the United States.
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The Shellpot Branch is a former Pennsylvania Railroad/Penn Central through-freight railroad owned and operated by Norfolk Southern since its acquisition, along with CSX Transportation, of Conrail in 1999. The branch allows Norfolk Southern, since the opening of a new bridge in 2001, to bypass the city of Wilmington, Delaware and allows direct access to both the Port of Wilmington and the New Castle Secondary, which connects to the Delmarva Subdivision of the Delmarva Central Railroad that runs to Central Delaware, Maryland, and Virginia's Eastern Shore. Both ends of the branch connect with Amtrak's Northeast Corridor and, like all of the PRR's through-freight lines, was electrified from 1935 until the Conrail era. The line was originally built doubly tracked, but was subsequently converted to single track.
Frankford Junction is a railroad junction, and former junction station, located on the border between the Harrowgate neighborhood of Philadelphia and Frankford, Philadelphia. At the junction, the 4-track Northeast Corridor line from Trenton connects with the 2-track Atlantic City Line from Atlantic City in the northeastern portion of Philadelphia about 2.9 miles (4.7 km) northeast of North Philadelphia station. It lies near the intersection of Frankford Avenue and Butler Street, to the west of the interchange between Interstate 95 and the approach to the Betsy Ross Bridge. It has been used for rail transportation since 1832 but has not served as a station since October 4, 1992.
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