The extremely high grade presented the final obstacle in conquering the Allegheny Mountains, making it necessary to build tunnels as early as 1850. The New Portage Tunnel was completed in 1854 at an elevation of 2,167 feet, and was traditionally (and still is) used primarily for eastbound traffic. The Allegheny Tunnel, at 3,605 feet in length, was completed that same year.
Near Horseshoe Curve, Altoona, on Norfolk Southern's main line.
Facility Amenities: ADA-compliant, Bus Parking, Free Admission, Gift Shop, Handicapped Access, Vending machines
General Information: Dates Closed: Mondays and major holidays, Hours: 11 a.m. - 5 p.m., Open Year-round