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Main Line (Pennsylvania Railroad)
The Main Line of the Pennsylvania Railroad was a rail line in the U.S. state of Pennsylvania, connecting Philadelphia with Pittsburgh via Harrisburg. It is still an important cross-state corridor, composed of Amtrak's Philadelphia to Harrisburg Main Line, SEPTA's Paoli/Thorndale Line and the Norfolk Southern Railway's Pittsburgh Line.
==Early history==
The eastern part of the PRR's main line (east of Lancaster) was built by the Commonwealth of Pennsylvania as part of the Main Line of Public Works, a hybrid railroad and canal corridor across the state. The system consisted of the Philadelphia and Columbia Railroad from Philadelphia west to Columbia on the Susquehanna River, the Eastern Division Canal from Columbia to Duncan's Island, the Juniata Division Canal from Duncan's Island to Hollidaysburg, the Allegheny Portage Railroad from Hollidaysburg to Johnstown, and the Western Division Canal from Johnstown to the terminus in Pittsburgh. The Philadelphia and Columbia Railroad had one inclined plane at each end; the Allegheny Portage Railroad had ten. The parts that were later included in the PRR main line opened from Philadelphia to Malvern (the end of the West Chester Railroad) in 1832〔, June 2004 Edition〕 and Malvern to Lancaster in 1834.〔, June 2004 Edition〕 A short piece of the Allegheny Portage Railroad in East Taylor Township and Conemaugh Township, including the Portage Viaduct over the Little Conemaugh River, later became part of the PRR main line; it was opened in 1834.〔
The Harrisburg, Portsmouth, Mountjoy and Lancaster Railroad opened from Harrisburg southeast to Middletown and from Lancaster northwest to Rheems in 1836.〔, June 2004 Edition〕 The next year the piece from Middletown to Elizabethtown opened,〔, June 2004 Edition〕 and the line was completed in 1838 with the opening of the Elizabethtown Tunnel.〔, June 2004 Edition〕
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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