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The Shellpot Branch (also called the Shellpot Secondary)〔(Norfolk Southern Harrisburg Region Timetable 1, August 4, 2008 )〕 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 Secondary 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 〔(PRR ''Eastern Region Electric Power System'', Drawing ET-1, dated June 10, 1935 ) Retrieved November 10, 2010〕 until the Conrail era. The line was originally built doubly tracked, but was subsequently converted to single track. == Route description == The line begins at its northern terminus at the Bell Interlocking 〔(PRR Ward and Bridge interlocking diagrams, dated Jan 1, 1962 ) Retrieved December 26, 2010.〕 near Claymont, Delaware, a flying junction built by the former Pennsylvania Railroad originally to allow thru-freight traffic access to the double-track Shellpot Branch from the four-track Philadelphia-Washington Mainline without crossing over any of the passenger-only tracks. Consisting of a single grade-separated overpass bridge used by northbound NEC (that is, Amtrak intercity and Wilmington/Newark Line commuter trains (southbound trains remain at ground level)), the two inner tracks which become the Shellpot Branch duck underneath of the bridge and comes level with the two passenger tracks at the Bellevue Substation , which converts the 138 kV, 25 Hz AC transmission power to the 11 kV, 25 Hz AC traction power used on the overhead catenary used by the Amtrak and SEPTA trains. See also Amtrak's 25 Hz Traction Power System. South of Bellevue, the two electrified tracks reduce to a single track, but less than a mile after the reduction, a non-electrified track that becomes the Shellpot Branch splits back off the electrified single track that eventually goes into Amtrak's Wilmington Maintenance Facility . An additional non-electrified track which serves DuPont's Edgemoor freight siding splits off from the NEC at the Interstate 495 underpass. Just after the divergence from the NEC right-of-way, the line enters the NS Edgemoor Yard facility. The line parallels I-495 and passes under 12th Street, then crosses over the Christina River on a single-track turntable bridge that was rebuilt in 2001 . Past the bridge, the New Castle Secondary (which joins the Delmarva Secondary at Bear, DE) splits off at a wye junction , also built in 2001 with the bridge, allowing both eastbound and westbound trains to access the line without having to go through Wilmington (which would only be allowed during overnight hours) and then reversing direction in Newport. The Shellpot Branch ends with the line rejoining the NEC at the line's Ragan interlocking near Interstate 95 in Newport, Delaware. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Shellpot Branch」の詳細全文を読む スポンサード リンク
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