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Wikipedia: 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 R5 Line and the Norfolk Southern Railway's Pittsburgh Line.
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![On the Way to Pittsburgh -- Great Bend on the Alleghenies, 1871 [On the Way to Pittsburgh -- Great Bend on the Alleghenies, 1871]](http://images.ookaboo.com/photo/s/On_the_Way_to_Pittsburgh_Great_Bend_on_the_Alleghenies_s.jpg)
![Crossing of the Alleghany, Pennsylvania Railroad, 1853 print [Crossing of the Alleghany, Pennsylvania Railroad, 1853 print]](http://images.ookaboo.com/photo/s/Crossing_of_the_Alleghany_2C_Pennsylvania_Railroad_s.jpg)