Plane Number 1 of the Portage Railroad was bypassed by the PRR on April 1, 1852. Other planes began to be bypassed by the New Portage Railroad, completed in 1856, but on February 15, 1854 the PRR's new line opened, leaving the old one on the east side of the ridge in Altoona and running west via the Horseshoe Curve and Gallitzin Tunnel, only using a short portion of the old Portage Railroad near South Fork and a longer adjacent section of New Portage Railroad. A reciprocal trackage rights agreement made March 18, 1854, allowed the PRR to use that section for free.