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Enhanced Station Initiative
Since the late 20th century, the Metropolitan Transportation Authority has started several projects to maintain and improve the New York City Subway. Some of these projects, such as subway line automation, proposed platform screen doors, the FASTRACK maintenance program, and infrastructural improvements proposed in 2015–2019 Capital Program, contribute toward improving the system's efficiency. Others, such as train-arrival "countdown clocks", "Help Point" station intercoms, "On the Go! Travel Station" passenger kiosks, wireless and cellular network connections in stations, MetroCard fare payment alternatives, and digital ads, are meant to benefit individual passengers. Yet others, including the various methods of subway construction, do not directly impact the passenger interface, but are used to make subway operations efficient. In the mid-1990s, it started converting the BMT Canarsie Line to use communications-based train control, using a moving block signal system that all ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bluetooth
Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to . It employs UHF radio waves in the ISM bands, from 2.402GHz to 2.48GHz. It is mainly used as an alternative to wire connections, to exchange files between nearby portable devices and connect cell phones and music players with wireless headphones. Bluetooth is managed by the Bluetooth Special Interest Group (SIG), which has more than 35,000 member companies in the areas of telecommunication, computing, networking, and consumer electronics. The IEEE standardized Bluetooth as IEEE 802.15.1, but no longer maintains the standard. The Bluetooth SIG oversees development of the specification, manages the qualification program, and protects the trademarks. A manufacturer must meet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunnelling Shield
A tunnelling shield is a protective structure used during the excavation of large, man-made tunnels. When excavating through ground that is soft, liquid, or otherwise unstable, there is a potential health and safety hazard to workers and the project itself from falling materials or a cave-in. A tunnelling shield can be used as a temporary support structure. It is usually in place for the short-term from when the tunnel section is excavated until it can be lined with a permanent support structure. The permanent structure may be made up of, depending on the period, bricks, concrete, cast iron, or steel. Although modern shields are commonly cylindrical, the first "shield", designed by Marc Isambard Brunel, was actually a large, rectangular, scaffold-like iron structure with three levels and twelve sections per level, with a solid load-bearing top surface. The structure protected the men from cave-ins as they laboured within it, digging the tunnel out in front of the shield. Histor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New York Public Library
The New York Public Library (NYPL) is a public library system in New York City. With nearly 53 million items and 92 locations, the New York Public Library is the second largest public library in the United States (behind the Library of Congress) and the fourth largest in the world. It is a private, non-governmental, independently managed, nonprofit corporation operating with both private and public financing. The library has branches in the boroughs of the Bronx, Manhattan, and Staten Island and affiliations with academic and professional libraries in the New York metropolitan area. The city's other two boroughs, Brooklyn and Queens, are not served by the New York Public Library system, but rather by their respective borough library systems: the Brooklyn Public Library and the Queens Public Library. The branch libraries are open to the general public and consist of circulating libraries. The New York Public Library also has four research libraries, which are also open to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New York City Steam System
The New York City steam systems include Con Edison's Steam Operations, and other smaller systems that provide steam to New York University and Columbia University. Many individual buildings in New York have their own steam systems. Con Edison's Steam Operations Con Edison's Steam Operations is a district heating system which carries steam from generating stations under the streets to heat and cool buildings and businesses in Manhattan. Some New York businesses and facilities also use steam for cleaning and disinfection. The New York Steam Company began providing service in lower Manhattan on March 3, 1882. Today, Consolidated Edison operates the largest commercial steam system in the world (larger than the next nine combined). The organization within Con Edison responsible for the system's operation, known as Steam Operations, provides steam service to over 1,700 commercial and residential customers in Manhattan from Battery Park to 96th Street uptown on the west sid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Immigration To The United States
Immigration has been a major source of population growth and cultural change throughout much of the history of the United States. In absolute numbers, the United States has a larger immigrant population than any other country in the world, with 47 million immigrants as of 2015. This represents 19.1% of the 244 million international migrants worldwide, and 14.4% of the United States' population. According to the 2016 Yearbook of Immigration Statistics, the United States admitted a total of 1.18 million legal immigrants (618k new arrivals, 565k status adjustments) in 2016. Of these, 48% were the immediate relatives of United States citizens, 20% were family-sponsored, 13% were refugees or asylum seekers, 12% were employment-based preferences, 4.2% were part of the Diversity Immigrant Visa program, 1.4% were victims of a crime (U1) or their family members were (U2 to U5), and 1.0% who were granted the Special Immigrant Visa (SIV) for Iraqis and Afghans employed by the Un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interborough Rapid Transit Company
The Interborough Rapid Transit Company (IRT) was the private operator of New York City's original underground subway line that opened in 1904, as well as earlier elevated railways and additional rapid transit lines in New York City. The IRT was purchased by the city in June 1940, along with the younger BMT and IND systems, to form the modern New York City Subway. The former IRT lines (the numbered routes in the current subway system) are now the A Division or IRT Division of the Subway. History The first IRT subway ran between City Hall and 145th Street at Broadway, opening on October 27, 1904. It opened following more than twenty years of public debate on the merits of subways versus the existing elevated rail system and on various proposed routes. Founded on May 6, 1902, by August Belmont, Jr., the IRT's mission was to operate New York City's initial underground rapid transit system after Belmont's and John B. McDonald's Rapid Transit Construction Company was aw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cut-and-cover
A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods. A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. The central portions of a rapid transit network are usually in the tunnel. Some tunnels are used as sewers or aqueducts to supply water for consumption or for hydroelectric stations. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment. Secret tunnels are built for military purposes, or by civilians for smuggling of weapons, contraband, or people. Special tunnels, such as wildlife crossings, are built to allow wildlife to cross human-made barriers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early History Of The IRT Subway
The first regularly operated subway in New York City was opened on October 27, 1904, and was operated by the Interborough Rapid Transit Company (IRT). The early IRT system consisted of a single trunk line below 96th Street in Manhattan, running under Broadway, 42nd Street, Park Avenue, and Lafayette Street. The line had three northern branches in Upper Manhattan and the Bronx, and a southern branch to Brooklyn. The system had four tracks between Brooklyn Bridge–City Hall and 96th Street, allowing for local and express service. The original line and early extensions consisted of: * The IRT Eastern Parkway Line from Atlantic Avenue–Barclays Center to Borough Hall * The IRT Lexington Avenue Line from Borough Hall to Grand Central–42nd Street * The IRT 42nd Street Shuttle from Grand Central–42nd Street to Times Square * The IRT Broadway–Seventh Avenue Line from Times Square to Van Cortlandt Park–242nd Street * The IRT Lenox Avenue Line from 96th Street t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbus Circle Subway Construction
Columbus is a Latinized version of the Italian surname "''Colombo''". It most commonly refers to: * Christopher Columbus (1451-1506), the Italian explorer * Columbus, Ohio, capital of the U.S. state of Ohio Columbus may also refer to: Places Extraterrestrial * Columbus (crater), a crater on Mars * ''Columbus'' (ISS module), the European module for the International Space Station * ''Columbus'' (spacecraft), a program to develop a European space station 1986–1991 Italy * Columbus (Rome), a residential district United States * Columbus, Arkansas * Columbus, Georgia * Columbus, Illinois * Columbus, Indiana, known for modern architecture * Columbus, Kansas * Columbus, Kentucky * Columbus, Minnesota * Columbus, Mississippi * Columbus, Missouri * Columbus, Montana * Columbus, Nebraska * Columbus, New Jersey * Columbus, New Mexico * Columbus, New York * Columbus, North Carolina * Columbus, North Dakota * Columbus, Ohio, the largest city in United States with this name * Colum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Four Track Subway IRT
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. In mathematics Four is the smallest composite number, its proper divisors being and . Four is the sum and product of two with itself: 2 + 2 = 4 = 2 x 2, the only number b such that a + a = b = a x a, which also makes four the smallest squared prime number p^. In Knuth's up-arrow notation, , and so forth, for any number of up arrows. By consequence, four is the only square one more than a prime number, specifically three. The sum of the first four prime numbers two + three + five + seven is the only sum of four consecutive prime numbers that yields an odd prime number, seventeen, which is the fourth super-prime. Four lies between the first proper pair of twin primes, three and five, which are the first two Fermat primes, like seventeen, which is the third. On the other ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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