From 1850 to 1854, the original PRR main line extended through what is now Altoona to a connection at Duncansville with the state-owned Allegheny Portage Railroad, whose eastern terminus was Hollidaysburg and whose canal connection linked to the Juniata Division of the Pennsylvania Canal. After Horseshoe Curve opened in 1854, PRR stopped using the Allegheny Portage Railroad, and the original main line became the Hollidaysburg Branch, now Conrail's Cove Secondary Track. The State had built the New Portage Railroad to replace the inclined planes of the Allegheny Portage Railroad while PRR was building Horseshoe Curve, but although the New Portage Railroad opened in 1855-56, PRR routed all trains over its own main line. PRR bought the state-owned rail and canal system in 1857, the New Portage Railroad was abandoned that same year, then reactivated in 1904 to handle increasing freight traffic and provide a relief route for the main line over Horseshoe, before being abandoned again in 1981. Also present were the former PRR Irvona Branch, now Conrail's Irvona Secondary Track; the S. E. Baker Railroad, later the Kittanning Run Railroad, abandoned circa 1917; and the Glen White Coal and Lumber Co. Railroad, which operated on both sides of the valley formed by Glen White Run and was abandoned circa 1938. The New Portage Railroad and New Portage Branch right-of-way was later severed by construction of a new route of U.S. 22, while Conrail's Philadelphia-Pittsburgh main line came to carry a large share of the railroad's east-west freight traffic as well as the Amtrak passenger trains Broadway Limited and Pennsylvanian.