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Downtown Hudson Tubes
The Downtown Hudson Tubes (formerly the Cortlandt Street Tunnel) are a pair of tunnels that carry PATH trains under the Hudson River in the United States, between New York City to the east and Jersey City, New Jersey, to the west. The tunnels run between the World Trade Center station on the New York side and the Exchange Place station on the New Jersey side. PATH operates two services through the Downtown Tubes, Newark–World Trade Center and Hoboken–World Trade Center. The former normally operates 24/7, while the latter only operates on weekdays. Description The Downtown Hudson Tubes use a roughly east-southeast to west-northwest path under the Hudson River, connecting Manhattan in the east with Jersey City in the west. Each track is located in its own tube, which enables better ventilation by the so-called piston effect. When a train passes through the tunnel it pushes out the air in front of it toward the closest ventilation shaft, and also pulls air into the rail t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flying Junction
A flying junction or flyover is a railway junction at which one or more diverging or converging tracks in a multiple-track route cross other tracks on the route by bridge to avoid conflict with other train movements. A more technical term is "grade-separated junction". A burrowing junction or dive-under occurs where the diverging line passes below the main line. The alternative to grade separation is a level junction or flat junction, where tracks cross at grade, and conflicting routes must be protected by interlocked signals. Complexity Simple flying junctions may have a single track pass over or under other tracks to avoid conflict, while complex flying junctions may have an elaborate infrastructure to allow multiple routings without trains coming into conflict, in the manner of a highway stack interchange. Flying junction without crossings Where two lines each of two tracks merge with a flying junction, they can become a four-track railway together, the tracks paired by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exchange Place Station (PATH)
Exchange Place is a station on the Port Authority Trans–Hudson (PATH) rail system in the Paulus Hook neighborhood of Jersey City, Hudson County, New Jersey. The station is on the Newark–World Trade Center line between Newark Penn Station and World Trade Center all week and the Hoboken–World Trade Center line during the day on weekdays to service Hoboken Terminal. Exchange Place provides access to the Jersey City waterfront and a station on the Hudson–Bergen Light Rail, where connections are available to Bayonne and North Bergen. Exchange Place station opened on July 19, 1909 as part of the original opening of the Hudson and Manhattan Railroad between the former Pennsylvania Railroad terminal at Exchange Place and Hudson Terminal. The station headhouse was rebuilt in 1989. Exchange Place station flooded after the September 11 attacks and was closed until June 29, 2003, when it became a temporary terminal. Service returned to World Trade Center on November 23. Hist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Gibbs McAdoo
William Gibbs McAdoo Jr.McAdoo is variously differentiated from family members of the same name: * Dr. William Gibbs McAdoo (1820–1894) – sometimes called "I" or "Senior" * William Gibbs McAdoo (1863–1941) – sometimes called "II" or "Junior" * Lt. William Gibbs McAdoo Jr. (1895–1960) – sometimes called "III" (October 31, 1863 – February 1, 1941) was an American lawyer and statesman. McAdoo was a leader of the Progressive movement and played a major role in the administration of his father-in-law President Woodrow Wilson. A member of the Democratic Party, he also represented California in the United States Senate. Born in Marietta, Georgia, McAdoo moved to Knoxville, Tennessee in his youth and graduated from the University of Tennessee. He established a legal practice in Chattanooga, Tennessee before moving to New York City in 1892. He gained fame as the president of the Hudson and Manhattan Railroad Company and served as the vice chairman of the Democratic Nation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hudson & Manhattan Railroad
Port Authority Trans-Hudson (PATH) is a rapid transit system in the northeastern New Jersey cities of Newark, Harrison, Jersey City, and Hoboken, as well as Lower and Midtown Manhattan in New York City. It is operated as a wholly owned subsidiary of the Port Authority of New York and New Jersey. PATH trains run around the clock year round; four routes serving 13 stations operate during the daytime on weekdays, while two routes operate during weekends, late nights, and holidays. It crosses the Hudson River through cast iron tunnels that rest on the river bottom. It operates as a deep-level subway in Manhattan and the Jersey City/Hoboken riverfront; from Grove Street in Jersey City to Newark, trains run in open cuts, at grade level, and on elevated track. In , the system saw rides, or about per weekday in . The routes of the PATH system were originally operated by the Hudson & Manhattan Railroad (H&M), built to link New Jersey's Hudson Waterfront with New York City. The syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Federal Transit Administration
The Federal Transit Administration (FTA) is an agency within the United States Department of Transportation (DOT) that provides financial and technical assistance to local public transportation systems. The FTA is one of ten modal administrations within the DOT. Headed by an Administrator who is appointed by the President of the United States, the FTA functions through Washington, D.C headquarters office and ten regional offices which assist transit agencies in all states, the District of Columbia, and the territories. Until 1991, it was known as the Urban Mass Transportation Administration (UMTA). Public transportation includes buses, subways, light rail, commuter rail, monorail, passenger ferry boats, trolleys, inclined railways, and people movers. The federal government, through the FTA, provides financial assistance to develop new transit systems and improve, maintain, and operate existing systems. The FTA oversees grants to state and local transit providers, primarily t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Department Of Transportation
The United States Department of Transportation (USDOT or DOT) is one of the executive departments of the U.S. federal government. It is headed by the secretary of transportation, who reports directly to the President of the United States and is a member of the president's Cabinet. The department's mission is "to develop and coordinate policies that will provide an efficient and economical national transportation system, with due regard for need, the environment, and the national defense." History Prior to the creation of the Department of Transportation, its functions were administered by the under secretary of commerce for transportation. In 1965, Najeeb Halaby, administrator of the Federal Aviation Agency (predecessor to the Federal Aviation Administration, FAA), suggested to President Lyndon B. Johnson that transportation be elevated to a cabinet-level post, and that the FAA be folded into the DOT. It was established by Congress in the Department of Transportation Act ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hudson Terminal
Hudson Terminal was a rapid transit station and office-tower complex in the Radio Row neighborhood of Lower Manhattan in New York City. Opened during 1908 and 1909, it was composed of a terminal station for the Hudson & Manhattan Railroad (H&M), as well as two 22-story office skyscrapers and three basement stories. The complex occupied much of a two-block site bounded by Greenwich, Cortlandt, Church, and Fulton Streets, which later became the World Trade Center site. The railroad terminal contained five tracks and six platforms serving H&M trains to and from New Jersey; these trains traveled via the Downtown Hudson Tubes, under the Hudson River, to the west. The two 22-story office skyscrapers above the terminal, the Fulton Building to the north and the Cortlandt Building to the south, were designed by architect James Hollis Wells of the firm Clinton and Russell in the Romanesque Revival style. The basements contained facilities such as a shopping concourse, an electrical subst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balloon Loop
A balloon loop, turning loop, or reversing loop ( North American Terminology) allows a rail vehicle or train to reverse direction without having to shunt or stop. Balloon loops can be useful for passenger trains and unit freight trains. Balloon loops are common on tram and streetcar systems. Many streetcar and tram systems use single-ended vehicles that have doors on only one side and controls at only one end. These systems may also haul trailers with no controls in the rear car, and, as such, must be turned at each end of the route. History Balloon loops were first introduced on tram and, later, metro lines. They did not commonly appear on freight railways until the 1960s, when the modernising British Rail system introduced '' merry-go-round'' (MGR) coal trains that operated from mines to power stations and back again without shunting. Tramways On the former Sydney tram system, loops were used from 1881 until the second-generation system's closure in 1961. Initia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbia University
Columbia University (also known as Columbia, and officially as Columbia University in the City of New York) is a private research university in New York City. Established in 1754 as King's College on the grounds of Trinity Church in Manhattan, Columbia is the oldest institution of higher education in New York and the fifth-oldest institution of higher learning in the United States. It is one of nine colonial colleges founded prior to the Declaration of Independence. It is a member of the Ivy League. Columbia is ranked among the top universities in the world. Columbia was established by royal charter under George II of Great Britain. It was renamed Columbia College in 1784 following the American Revolution, and in 1787 was placed under a private board of trustees headed by former students Alexander Hamilton and John Jay. In 1896, the campus was moved to its current location in Morningside Heights and renamed Columbia University. Columbia scientists and scholars have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piston Effect
Piston effect refers to the forced-air flow inside a tunnel or shaft caused by moving vehicles. It is one of numerous phenomena that engineers and designers must consider when developing a range of structures. Cause In open air, when a vehicle travels along, air pushed aside can move in any direction except into the ground. Inside a tunnel, air is confined by the tunnel walls to move along the tunnel. Behind the moving vehicle, as air has been pushed away, suction is created, and air is pulled to flow into the tunnel. In addition, because of fluid viscosity, the surface of the vehicle drags the air to flow with vehicle, a force experienced as skin drag by the vehicle. This movement of air by the vehicle is analogous to the operation of a mechanical piston as inside a reciprocating compressor gas pump, hence the name "piston effect". The effect is also similar to the pressure fluctuations inside drainage pipes as waste water pushes air in front of it. The piston effect is ver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ventilation (architecture)
Ventilation is the intentional introduction of outdoor air into a space. Ventilation is mainly used to control indoor air quality by diluting and displacing indoor pollutants; it can also be used to control indoor temperature, humidity, and air motion to benefit thermal comfort, satisfaction with other aspects of indoor environment, or other objectives. The intentional introduction of outdoor air is usually categorized as either mechanical ventilation, natural ventilation, or mixed-mode ventilation (hybrid ventilation). * Mechanical ventilation is the intentional fan driven flow of outdoor air into a building. Mechanical ventilation systems may include supply fans (which push outdoor air into a building), exhaust fans (which draw air out of building and thereby cause equal ventilation flow into a building), or a combination of both. Mechanical ventilation is often provided by equipment that is also used to heat and cool a space. * Natural ventilation is the intentional passive fl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
