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A retractable roof is a roof system designed to roll back the roof of a structure so that the interior of the facility is open to the outdoors. [1] Retractable roofs are sometimes referred to as operable roofs or retractable skylights. The term operable skylight, while quite similar, refers to a skylight that opens on a hinge, rather than on a ...
It is one of seven tunnels completed for the Pennsylvania Turnpike, and one of four still in use today. The Kittatinny Mountain Tunnel is 4,727 feet (1,441 m) in length, [ 1 ] and is located 600 feet (180 m) west of the Blue Mountain Tunnel , separated by the Gunter Valley.
Also known as Mount Washington Coal Tunnel. Sometimes confused with the Mount Washington Transit Tunnel, which follows a similar alignment at a lower elevation of Mount Washington. [3] Schenley Tunnel: P&W Subdivision: 40°26'46.72"N, 79°56'50.53"W: Squirrel Hill Tunnel: I-376 / US 22 / US 30: Squirrel Hill: 40°25'40.8"N, 79°55'34.7"W ...
The walls are approximately 1 ft 9 in (0.53 m) thick and extend 12 feet (3.7 m) above the top of barrier to the intersection with the roof arch. The roof arch is 3 feet (0.91 m) thick with an inside radius of 19 ft 3 in (5.87 m). Since August 1987, the tunnels have provided cellular phone reception. [1]
Pages in category "Railroad tunnels in Pennsylvania" The following 31 pages are in this category, out of 31 total. This list may not reflect recent changes. B.
The Tuscarora Mountain tunnels measure 1.1 miles (1.8 km) in length and are the second-longest active tunnels on the Pennsylvania Turnpike system. The 1.3-mile-long (2.1 km) Sideling Hill Tunnel is the longest overall, but was abandoned in 1968. Allegheny Mountain Tunnel is the longest in active use. The Tuscarora Mountain Tunnel sits on the ...
PA-127-F: East Broad Top Railroad and Coal Company, Sideling Hill Tunnel: 1874 1986 Former East Broad Top Railroad and Coal Company: Sideling Hill: Rockhill Furnace: Huntingdon: PA-127-J: East Broad Top Railroad and Coal Company, Wray's Hill Tunnel 1986 Former East Broad Top Railroad and Coal Company: Rays Hill: Robertsdale: Huntingdon: PA-240 ...
The Allegheny Mountain Tunnel is a vehicular tunnel carrying the Pennsylvania Turnpike through the Allegheny Mountains. At this point, the Turnpike carries Interstates 70 and 76. When the tunnel was built, it was considered an "engineering marvel." [1] The tunnel was built in 1939 and is used by 11 million vehicles annually today.