1.
Washington Metro
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The Washington Metro, known colloquially as Metro and branded Metrorail, is the heavy rail rapid transit system serving the Washington, D. C. metropolitan area in the United States. It is administered by the Washington Metropolitan Area Transit Authority, which also operates Metrobus service under the Metro name, besides the District, Metro serves several jurisdictions in Maryland and Virginia. In Maryland, Metro provides service to Montgomery and Prince Georges counties, in Virginia, to Arlington and Fairfax counties and the independent city of Alexandria. Combined with its ridership in the independent Virginia cities of Falls Church and Fairfax, the system is currently being expanded into Loudoun County, Virginia. It operates mostly as a subway in the District itself, while most of the tracks are at surface level or elevated. Opened in 1976, the network now includes six lines,91 stations, Metro is the second-busiest rapid transit system in the United States in number of passenger trips, after the New York City Subway. There were 215.3 million trips on Metro in fiscal year 2015, in June 2008, Metro set a monthly ridership record with 19,729,641 trips, or 798,456 per weekday. Fares vary based on the distance traveled, the time of day, Riders enter and exit the system using a proximity card called SmarTrip. Metro also has the distinction of having the longest, single-tier escalator in the Western Hemisphere in the Wheaton station, during the 1960s plans were laid for a massive freeway system in Washington. But the plan met fierce opposition, and was altered to include a Capital Beltway system plus rail line radials, the Beltway received full funding, funding for the ambitious Inner Loop Freeway system was partially reallocated toward construction of the Metro system. In 1960 the federal government created the National Capital Transportation Agency to develop a rail system. In 1966, a bill creating WMATA was passed by the government, the District of Columbia, Virginia. WMATA approved plans for a 98-mile regional system in 1968, the first portion of the system opened March 27,1976, with 4.6 miles available on the Red Line with five stations from Rhode Island Avenue to Farragut North, all in the District of Columbia. Underground stations were built with arches of concrete, highlighted by soft. The name Metro was suggested by Massimo Vignelli, who designed the subway maps for the New York City Subway, the 103-mile, 83-station system was completed with the opening of the Green Line segment to Branch Avenue on January 13,2001. This did not mean the end of the growth of the system, the first in-fill station, NoMa – Gallaudet University on the Red Line between Union Station and Rhode Island Ave-Brentwood, opened November 20,2004. Construction began in March 2009 for an extension to Dulles Airport to be built in two phases, the first phase, five stations connecting East Falls Church to Tysons Corner and Wiehle Avenue in Reston, opened on July 26,2014. Metro construction required billions of dollars, originally provided by Congress under the authority of the National Capital Transportation Act of 1969
2.
Blue Line (Washington Metro)
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The Blue Line of the Washington Metro in the United States consists of 27 rapid transit stations from Franconia–Springfield to Largo Town Center. It has stations in Fairfax County, Alexandria and Arlington, Virginia, the District of Columbia, thirteen of the lines stations are shared with the Orange Line,18 are shared with the Silver Line and 9 are shared with the Yellow Line. Only one station – Arlington Cemetery Station – is exclusive to the Blue Line, planning for Metro began with the Mass Transportation Survey in 1955 which attempted to forecast both freeway and mass transit systems sufficient to meet the needs of 1980. In 1959, the final report included two rapid transit lines which anticipated subways in downtown Washington. It did not include a route in Prince Georges County, the route continued in rapid transit plans until the formation of WMATA. With the formation of WMATA in October 1966, planning of the system shifted from federal hands to a body with representatives of the District, Maryland. Congressional route approval was no longer a key consideration, instead, routes had to serve each local suburban jurisdiction to assure that they would approve bond referenda to finance the system. In March 1968, the WMATA board approved its 98-mile Adopted Regional System which included the Blue Line from Huntington to Addison Road, the ARS contained a Blue Line/Orange Line station at Oklahoma Avenue between Stadium/Armory and the Anacostia River Bridge. Local residents objected to a proposed 1, 000-car commuter parking lot at that station, in reaction to their lobbying, the DC government insisted that the station be removed and that the tunnel for the line be extended through the neighborhood. This then made the line the only one to have a station canceled due to neighborhood opposition, to better accommodate tourists, a Smithsonian station exit was added on the Mall and the federal government requested in 1972 that the Arlington Cemetery Station be added to the Blue Line. The federal government paid the cost of design changes. Service on the Blue Line began on July 1,1977, the line was extended by three stations to Addison Road on November 22,1980. Service south of National Airport began on June 15,1991 when Van Dorn Street opened, the original plan for the line was completed when this link was extended to Franconia–Springfield on June 29,1997. Two new stations in Maryland – Morgan Boulevard and Largo Town Center – opened on December 18,2004, beginning December 1,1979, the Orange Line diverged westward from Rosslyn to Ballston. The Blue and Orange Lines remain co-aligned from Rosslyn to Stadium-Armory, the Blue Line was originally planned to follow a slightly different route. The plan would have sent Blue Line trains to Huntington, with Yellow Line trains serving Franconia–Springfield and this was changed due to a shortage of rail cars at the time of the completion of the line to Huntington. From 1999 to 2008, the Blue Line operated to Huntington on July 4, the ARS had the Blue Line end at Addison Road. However, sports fans continually argued for an extension to the Capital Centre sports arena in Largo
3.
Rapid transit
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Rapid transit, also known as heavy rail, metro, subway, tube, or underground, is a type of high-capacity public transport generally found in urban areas. The stations typically have high platforms, without steps inside the trains and they are typically integrated with other public transport and often operated by the same public transport authorities. However, some transit systems have at-grade intersections between a rapid transit line and a road or between two rapid transit lines. It is unchallenged in its ability to transport large numbers of people quickly over short distances with little use of land, variations of rapid transit include people movers, small-scale light metro, and the commuter rail hybrid S-Bahn. The worlds first rapid-transit system was the partially underground Metropolitan Railway which opened as a railway in 1863. In 1868, New York opened the elevated West Side and Yonkers Patent Railway, china has the largest number of rapid transit systems in the world. The worlds longest single-operator rapid transit system by length is the Shanghai Metro. The worlds largest single rapid transit service provider by both length of revenue track (665 miles and number of stations is the New York City Subway. The busiest rapid transit systems in the world by annual ridership are the Tokyo subway system, the Seoul Metropolitan Subway, the Moscow Metro, the Beijing Subway, Metro is the most common term for underground rapid transit systems used by non-native English speakers. One of these terms may apply to a system, even if a large part of the network runs at ground level. In Scotland, however, the Glasgow Subway underground rapid transit system is known as the Subway, in the US, underground mass transit systems are primarily known as subways, whereas the term metro is a shortened reference to a metropolitan area. In that vein, Chicagos commuter rail system, serving the area, is called Metra. Exceptions in naming rapid transit systems are Washington DCs subway system the Washington Metro, Los Angeles Metro Rail, and the Miami Metrorail, the opening of Londons steam-hauled Metropolitan Railway in 1863 marked the beginning of rapid transit. Initial experiences with steam engines, despite ventilation, were unpleasant, experiments with pneumatic railways failed in their extended adoption by cities. Electric traction was more efficient, faster and cleaner than steam, in 1890 the City & South London Railway was the first electric-traction rapid transit railway, which was also fully underground. Both railways were merged into London Underground. The 1893 Liverpool Overhead Railway was designed to use electric traction from the outset, budapest in Hungary and Glasgow, Chicago and New York all converted or purpose-designed and built electric rail services. Advancements in technology have allowed new automated services, hybrid solutions have also evolved, such as tram-train and premetro, which incorporate some of the features of rapid transit systems
4.
Alexandria, Virginia
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Arlington County is a county in the Commonwealth of Virginia. It is coterminous with the U. S. Census Bureau-census-designated place of Arlington, as a result, the county is often referred to in the region simply as Arlington or Arlington, Virginia. In 2015, the population was estimated at 229,164. The land that became Arlington was originally donated by Virginia to the United States government to form part of the new federal district of Columbia. In 1846, Congress returned the land southwest of the Potomac River donated by Virginia due to issues involving Congressional representation, the General Assembly of Virginia changed the countys name to Arlington in 1920 to avoid confusion with the adjacent City of Alexandria. The county is situated in Northern Virginia on the bank of the Potomac River directly across from Washington. Arlington is also bordered by Fairfax County and City of Falls Church to the northwest, west and southwest, as of the 2010 census, the population was 207,627. Due to the proximity to downtown Washington, D. C. It is also home to Ronald Reagan Washington National Airport, the many federal agencies, government contractors, and service industries contribute to Arlingtons stable economy. It is the county in the United States by median family income. According to a 2016 study by Bankrate. com, Arlington is the best place to retire, the area that now constitutes Arlington County was originally part of Fairfax County in the Colony of Virginia. Land grants from the British monarch were awarded to prominent Englishmen in exchange for political favors, one of the grantees was Thomas Fairfax, 6th Lord Fairfax of Cameron, who lends his name to both Fairfax County and the City of Fairfax. George Washington Parke Custis, grandson of First Lady Martha Washington, the estate was eventually passed down to Mary Anna Custis Lee, wife of General Robert E. Lee. The property later became Arlington National Cemetery during the American Civil War, the area that now contains Arlington County was ceded to the new United States federal government by the Commonwealth of Virginia. With the passage of the Residence Act in 1790, Congress approved a new permanent capital to be located on the Potomac River, the Residence Act originally only allowed the President to select a location within Maryland as far east as what is now the Anacostia River. However, President Washington shifted the federal territorys borders to the southeast in order to include the city of Alexandria at the Districts southern tip. In 1791, Congress amended the Residence Act to approve the new site, however, this amendment to the Residence Act specifically prohibited the erection of the public buildings otherwise than on the Maryland side of the River Potomac. As permitted by the U. S. Constitution, the shape of the federal district was a square, measuring 10 miles on each side
5.
Virginia
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Virginia is a state located in the Mid-Atlantic region of the United States, as well as in the historic Southeast. The geography and climate of the Commonwealth are shaped by the Blue Ridge Mountains and the Chesapeake Bay, the capital of the Commonwealth is Richmond, Virginia Beach is the most populous city, and Fairfax County is the most populous political subdivision. The Commonwealths estimated population as of 2014 is over 8.3 million, the areas history begins with several indigenous groups, including the Powhatan. In 1607 the London Company established the Colony of Virginia as the first permanent New World English colony, slave labor and the land acquired from displaced Native American tribes each played a significant role in the colonys early politics and plantation economy. Although the Commonwealth was under one-party rule for nearly a century following Reconstruction, the Virginia General Assembly is the oldest continuous law-making body in the New World. The state government was ranked most effective by the Pew Center on the States in both 2005 and 2008 and it is unique in how it treats cities and counties equally, manages local roads, and prohibits its governors from serving consecutive terms. Virginias economy changed from agricultural to industrial during the 1960s and 1970s. Virginia has an area of 42,774.2 square miles, including 3,180.13 square miles of water. Virginias boundary with Maryland and Washington, D. C. extends to the mark of the south shore of the Potomac River. The southern border is defined as the 36° 30′ parallel north, the border with Tennessee was not settled until 1893, when their dispute was brought to the U. S. Supreme Court. The Chesapeake Bay separates the portion of the Commonwealth from the two-county peninsula of Virginias Eastern Shore. The bay was formed from the river valleys of the Susquehanna River. Many of Virginias rivers flow into the Chesapeake Bay, including the Potomac, Rappahannock, York, and James, the Tidewater is a coastal plain between the Atlantic coast and the fall line. It includes the Eastern Shore and major estuaries of Chesapeake Bay, the Piedmont is a series of sedimentary and igneous rock-based foothills east of the mountains which were formed in the Mesozoic era. The region, known for its clay soil, includes the Southwest Mountains around Charlottesville. The Blue Ridge Mountains are a province of the Appalachian Mountains with the highest points in the state. The Ridge and Valley region is west of the mountains and includes the Great Appalachian Valley, the region is carbonate rock based and includes Massanutten Mountain. The Cumberland Plateau and the Cumberland Mountains are in the southwest corner of Virginia, in this region, rivers flow northwest, with a dendritic drainage system, into the Ohio River basin
6.
Island platform
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An island platform is a station layout arrangement where a single platform is positioned between two tracks within a railway station, tram stop or transitway interchange. Island platforms are popular on twin-track routes due to pragmatic and cost-effective reasons, an alternative arrangement is to position side platforms on either side of the tracks. The historical use of island platforms depends greatly upon the location, the island platform layout is a popular, cost-effective and practical solution in modern railway systems. Island platforms allow facilities such as escalators, elevators, shops, toilets and this is essential for wheelchair accessible stations. An island platform makes it easier for users and the infirm to change services between tracks. Additionally, an island platform layout eliminates the need to construct a crossover or subway between two platforms, however, island platforms may become overcrowded, especially at busy stations, and this can lead to safety issues such as Clapham Common and Angel on the London Underground. However, for the tracks to diverge around the platform, extra width is required along the right-of-way on each approach to the station. Track centers vary for rail systems throughout the world but are normally 3 to 5 meters, if the island platform is 6 meters wide, the tracks have to slew out by the same distance. While this is not a problem on a new line that is being constructed, in addition, a single island platform makes it quite difficult to have through tracks, which are usually between the local tracks. A common configuration in busy locations on high speed lines is a pair of island platforms, high-speed trains can therefore pass straight through the station, while slow trains pass around the platforms. This arrangement also allows the station to serve as a point where trains can be passed by faster trains. The purpose of this design was to reduce unnecessary passenger congestion at a station with a high volume of passengers. Many of the stations on the Great Central Railway were constructed in this form and this was because the line was planned to connect to a Channel Tunnel. Island platforms are a normal sight on Indian railway stations. Almost all railway stations in India consist of island platforms, in Toronto,29 subway stations use island platforms. A slight disadvantage is that crossovers have to be rather long, in southern New Jersey and Philadelphia, PATCO uses island platforms in all of its 13 stations, to facilitate one-person train operation. Most elevated stations in Singapores Mass Rapid Transit system use island platforms, the exception is Dover MRT Station, which uses side platforms as it is built on an existing rail line. The planned Canberra MRT Station will also use side platforms, as it also be built on an existing rail line
7.
DASH (bus)
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Driving Alexandria Safely Home is the public bus system for the city of Alexandria, Virginia, operated by the Alexandria Transit Company. DASH serves all of the Alexandria Metrorail Stations and the Pentagon Metrorail station during morning and evening peak periods, Alexandria Transit Company is a non-profit service corporation wholly owned by the City of Alexandria and currently operates at 85 buses, which also consists of the King Street Trolleys. ATC provides a bus service within the City of Alexandria on nine routes and carries more than four million passengers annually. ATC operates transit services within portions of the City of Alexandria, aTC’s purpose is to supplement the regional rail and bus service provided by the Washington Metropolitan Area Transit Authority and to provide a local bus service to the City of Alexandria. In 1981, in anticipation of the opening of the Metrorail stations and the subsequent reordering of Metrobus service, in 1982, the study recommended a five-route system, using 18 buses. In 1983, the City Council developed an RFP for management companies to develop a plan for the operation of transit service in the City of Alexandria. The city chose to establish a public service cooperation that would be wholly owned by the City. On October 23,1983 the City Council set up a Transitional Task Force and, on January 24,1984, the certificate of incorporation was issued by the State Corporation Commission on January 31, and the organizational meeting of the company was held February 6. DASH carries over 12,000 passengers per weekday within the City of Alexandria, Virginia, the AT8 route, which runs through the Duke Street corridor, is DASHs busiest route with about 3,000 rides per weekday. In 2011, DASH ordered three new 40 Gillig Low Floor diesel-electric hybrid buses, which are 5 longer than the rest of the DASH fleet and these buses went into service in April 2012. Five additional 40 Gillig Low Floor diesel-electric hybrid buses went into service in March 2013, the new 40 buses are used on the AT8 route to reduce crowding. On July 28,2014, DASH introduced the new AT9 Crosstown Route, DASHs current base fare is $1.60 for riders paying cash or SmarTrip. In 2007, DASH converted its buses to allow the use of the WMATA SmarTrip, DASH continued to accept and issue paper transfers until they were eliminated altogether January 1,2013. All buses are equipped with bike racks, ^operates under the King Street Trolley branding Official site
8.
Fort Totten station
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Fort Totten is a Washington Metro station in northeastern Washington, D. C. It acts as a point between the Green and Red Lines with Yellow Line service during off-peak hours. It is the last station on the Green Line in the District of Columbia before heading into Maryland, Fort Totten is located in the middle of Fort Totten Park in Northeast and is accessed via Galloway Street. The station is considered to be in the neighborhood of Fort Totten, the stations name comes from a Civil War-era fortification which itself was named after General Joseph Gilbert Totten, the Chief Engineer of the antebellum US Army. Service began on the Red Line platform on February 6,1978, between 1993 and September 1999, Fort Totten served as the terminus of the northern portion of the Green Line until the opening of stations between Fort Totten and Mount Vernon Square. Beginning on December 31,2006 as part of an 18-month trial, Metro extended Yellow Line service to Fort Totten station during non-rush hours and weekends. On June 22,2009, two southbound Metro trains on the Red Line collided between the Takoma and Fort Totten stations, killing 9 and injuring 80, the deadliest accident in the systems history, a plaque inside the stations mezzanine commemorates the victims of the crash. Plans are in the works to one day create a site outside the station after the current accommodations were deemed insensitive by the victims families. The lower-level platform for the Green Line is unique in that it is built into a hillside, part underground in a rock tunnel, and part at ground level in an open cut
9.
Metro station
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A metro station or subway station is a railway station for a rapid transit system, which as a whole is usually called a Metro or Subway. The station provides a means for passengers to purchase tickets, access trains stopping at its platforms, the location of a metro station is carefully planned to provide easy access to important urban facilities such as roads, commercial centers, major buildings and other transport nodes. Most stations are located underground, with entrances/exits leading up to ground or street level, the bulk of the station typically positioned under land reserved for public thoroughfares or parks. This is especially important where the station is serving high-density urban precincts, in other cases, a station may be elevated above a road, or at ground level depending on the level of the train tracks. The physical, visual and economic impact of the station and its operations will be greater, planners will often take metro lines or parts of lines at or above ground where urban density decreases, extending the system further for less cost. Metros are most commonly used in cities, with great populations. Alternatively, a railway land corridor is re-purposed for rapid transit. At street level the logo of the company marks the entrances/exits of the station. Usually, signage shows the name of the station and describes the facilities of the station, often there are several entrances for one station, saving pedestrians from needing to cross a street and reducing crowding. A metro station typically provides ticket vending and ticket validating systems, the station is divided into an unpaid zone connected to the street, and a paid zone connected to the train platforms. The ticket barrier allows passengers with tickets to pass between these zones. The barrier may operated by staff or more typically with automated turnstiles or gates that open when a pass is scanned or detected. Some small metro systems dispense with paid zones and validate tickets with staff in the train carriages, access from the street to ticketing and the train platform is provided by stairs, concourses, escalators, elevators and tunnels. The station will be designed to minimise overcrowding and improve flow, permanent or temporary barriers may be used to manage crowds. Some metro stations have connections to important nearby buildings. Most jurisdictions mandate that people with disabilities must have unassisted use of the station and this is resolved with elevators, taking a number of people from street level to the unpaid ticketing area, and then from the paid area to the platform. In addition, there will be stringent requirements for emergencies, with lighting, emergency exits. Stations are a part of the evacuation route for passengers escaping from a disabled or troubled train
10.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
11.
Escalator
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An escalator is a vertical transportation device in the form of a moving staircase – a conveyor which carries people between floors of a building. It consists of a chain of individually linked steps. These steps are guided on either side by a pair of tracks which force them to remain horizontal, escalators are used around the world in places where elevators would be impractical. Principal areas of usage include department stores, shopping malls, airports, transit systems, convention centers, hotels, arenas, stadiums, escalators have the capacity to move a large number of people, and they can be placed in the same physical space as a staircase. They have no waiting interval, they can be used to guide people toward main exits or special exhibits, a non-functioning escalator can function as a normal staircase, whereas many other conveyances become useless when they break down. Escalators, like moving walkways, move at constant speeds of around 0. 3–0.6 metres per second, the typical angle of inclination of an escalator to the horizontal is 30 degrees, and the total difference in height can be about 18 metres or more. Modern escalators have single-piece aluminum or stainless steel steps that move on a system of tracks in a continuous loop, escalators have three typical configuration options, parallel, crisscross, and multiple parallel. As a safety measure, escalators are required to have moving handrails that keep pace with the movement of the steps and this helps riders steady themselves, especially when stepping onto the moving stairs. Occasionally, a handrail will move at a different speed from the steps. The loss of synchronization between handrail and step speed can result from slippage and wear, as a result, escalators must have moving handrails that move at the same speed as the moving stairs of the escalator. The direction of movement can be permanently set, or controlled manually depending on the predominant flow of the crowd. In some setups, the direction is controlled by whoever arrives first, a number of factors affect escalator design. These include physical requirements, location, traffic patterns, safety considerations, foremost, physical factors like the vertical and horizontal distance to be spanned must be considered. These factors will determine the length and pitch of the escalator, the building infrastructure must be able to support the heavy components. The escalator should be located where it can be seen by the general public. Furthermore, up and down escalator traffic should be physically separated, traffic patterns must also be anticipated. The escalators must be designed to carry the number of passengers. For example, a single-width escalator traveling at about 0.5 metres per second can move about 2000 people per hour, the carrying capacity of an escalator system must match the expected peak traffic demand
12.
Elevator
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An elevator or lift is a type of vertical transportation that moves people or goods between floors of a building, vessel, or other structure. Elevators are generally powered by electric motors that either drive traction cables or counterweight systems like a hoist, in agriculture and manufacturing, an elevator is any type of conveyor device used to lift materials in a continuous stream into bins or silos. Several types exist, such as the chain and bucket elevator, grain auger screw conveyor using the principle of Archimedes screw, or the chain, languages other than English may have loanwords based on either elevator or lift. Because of wheelchair access laws, elevators are often a requirement in new multistory buildings. The earliest known reference to an elevator is in the works of the Roman architect Vitruvius, some sources from later historical periods mention elevators as cabs on a hemp rope powered by hand or by animals. In 1000, the Book of Secrets by al-Muradi in Islamic Spain described the use of a lifting device. In the 17th century the prototypes of elevators were located in the buildings of England. Louis XV of France had a flying chair built for one of his mistresses at the Chateau de Versailles in 1743. Ancient and medieval elevators used drive systems based on hoists or winders, the invention of a system based on the screw drive was perhaps the most important step in elevator technology since ancient times, leading to the creation of modern passenger elevators. The first screw drive elevator was built by Ivan Kulibin and installed in Winter Palace in 1793, several years later another of Kulibins elevators was installed in Arkhangelskoye near Moscow. The development of elevators was led by the need for movement of raw materials including coal, the technology developed by these industries and the introduction of steel beam construction worked together to provide the passenger and freight elevators in use today. Starting in the mines, by the mid-19th century elevators were operated with steam power and were used for moving goods in bulk in mines and factories. It elevated paying customers to a height in the center of London. Early, crude steam-driven elevators were refined in the decade, – in 1835 an innovative elevator called the Teagle was developed by the company Frost. The elevator was belt-driven and used a counterweight for extra power, the hydraulic crane was invented by Sir William Armstrong in 1846, primarily for use at the Tyneside docks for loading cargo. These quickly supplanted the steam driven elevators, exploiting Pascals law. A water pump supplied a variable level of pressure to a plunger encased inside a vertical cylinder. Counterweights and balances were used to increase the lifting power of the apparatus
rapid transit station
DASH: AT2, AT3, AT4, AT5
3.3%
toward Franconia–Springfield (King Street–Old Town)
toward Huntington (King Street–Old Town)
Media related to Braddock Road (WMATA station) at Wikimedia Commons
