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Allegheny Tunnel
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." The tunnel was built in 1939 and is used by 11 million vehicles annually today. Throughout the 2000s, state officials attempted to implement plans to replace the tunnel, citing its age. History The original Allegheny Mountain Tunnel was built in the late 19th century for the South Pennsylvania Railroad, which was never completed. This tunnel was not used due to concerns about its structural integrity. The eastern end of this original tunnel can be seen by parking on the service road at the turnpike's eastern portal and walking up to the area just above and a bit north of the turnpike portal. The opening is visible in the rocks just uphill. Entering this old tunnel is prohibited. The current westbound tunnel was built in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somerset County, Pennsylvania
Somerset County (Pennsylvania Dutch language, Pennsylvania German: ''Somerset Kaundi'') is a County (United States), county in the Commonwealth (U.S. state), Commonwealth of Pennsylvania. As of the 2020 United States census, 2020 census, the population was 74,129. Its county seat is Somerset, Pennsylvania, Somerset. The county was created from part of Bedford County, Pennsylvania, Bedford County on April 17, 1795, and named after the county of Somerset in England. Somerset County comprises the Somerset, PA micropolitan statistical area, which is included in the Johnstown, Pennsylvania, Johnstown–Somerset, PA combined statistical area. The county is famous for being the crash site of United Airlines Flight 93, one of the four flights involved in the September 11 attacks, which crashed near the village of Shanksville, Pennsylvania, Shanksville after the flight's passengers struggled with Al-Qaeda hijackers for control of the plane, which terrorists intended to fly into either t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Explosives
An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An explosive charge is a measured quantity of explosive material, which may either be composed solely of one ingredient or be a mixture containing at least two substances. The potential energy stored in an explosive material may, for example, be * chemical energy, such as nitroglycerin or grain dust * pressurized gas, such as a gas cylinder, aerosol can, or BLEVE * nuclear energy, such as in the fissile isotopes uranium-235 and plutonium-239 Explosive materials may be categorized by the speed at which they expand. Materials that detonate (the front of the chemical reaction moves faster through the material than the speed of sound) are said to be "high explosives" and materials that deflagrate are said to be "low explosives". Explosives may al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toll Tunnels In Pennsylvania
Toll may refer to: Transportation * Toll (fee) a fee charged for the use of a road or waterway ** Road pricing, the modern practice of charging for road use ** Road toll (historic), the historic practice of charging for road use ** Shadow toll, payments made by government to the private sector operator of a road based on the number of vehicles using the road * Road toll (Australia and New Zealand), term for road death toll, i.e., the number of deaths caused annually by road accidents Brands and enterprises * Toll Brothers, Horsham Township, Pennsylvania based construction company founded by brothers Robert I. Toll and Bruce E. Toll * Toll Collect, a transportation support company in Germany * Toll Group, an Australian transportation company ** Toll Domestic Forwarding, an Australian freight forwarder ** Toll Ipec, Australian transportation company ** Toll Resources & Government Logistics Science * Toll (gene), encode members of the Toll-like receptor class of proteins * Toll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transportation Buildings And Structures In Somerset County, Pennsylvania
Transport (in British English), or transportation (in American English), is the intentional movement of humans, animals, and goods from one location to another. Modes of transport include air, land (rail and road), water, cable, pipeline, and space. The field can be divided into infrastructure, vehicles, and operations. Transport enables human trade, which is essential for the development of civilizations. Transport infrastructure consists of both fixed installations, including roads, railways, airways, waterways, canals, and pipelines, and terminals such as airports, railway stations, bus stations, warehouses, trucking terminals, refueling depots (including fueling docks and fuel stations), and seaports. Terminals may be used both for interchange of passengers and cargo and for maintenance. Means of transport are any of the different kinds of transport facilities used to carry people or cargo. They may include vehicles, riding animals, and pack animals. Vehicles may inclu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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