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Washington Metro Rolling Stock
The rolling stock of the Washington Metro system consists of 1,242 cars that were acquired across seven orders. All cars operate as married pairs (consecutively numbered even-odd), with systems shared across the pair. The 7000-series cars, the system's newest, have an operator's cab in only one of each married pair's cars (the even numbered one) and operate in groups of three or four. The system's track gauge is narrower than . Also, at above top of rail, the floor height of the cars is lower than that of most other East Coast mass transit systems, including New York City, Boston and Philadelphia. , Metro owns a fleet of 1,216 cars, 1,208 of which were in active revenue service. Rail yards There are ten Metrorail storage and overhaul facilities totaling more than of workspace. One is currently under development. Active 3000-series The third order consisted of 290 cars, also from Breda, with delivery in 1987. These cars are numbered 3000–3289 as delivere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rolling Stock
The term rolling stock in the rail transport industry refers to railway vehicles, including both powered and unpowered vehicles: for example, locomotives, Railroad car#Freight cars, freight and Passenger railroad car, passenger cars (or coaches), and Railroad car#Non-revenue cars, non-revenue cars. Passenger vehicles can be un-powered, or self-propelled, Railcar, single or Multiple unit, multiple units. In North America, Australia and other countries, the term consist ( ) is used to refer to the rolling stock comprising a train, a list containing specific information for each car of a train, or a group of locomotives. In the United States, the term ''rolling stock'' has been expanded from the older broadly defined "trains" to include wheeled vehicles used by businesses on roadways. The word ''stock'' in the term is used in a sense of inventory. Rolling stock is considered to be a liquid asset, or close to it, since the value of the vehicle can be readily estimated and then ship ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
8000-series
8 (eight) is the natural number following 7 and preceding 9. Etymology English ''eight'', from Old English '', æhta'', Proto-Germanic ''*ahto'' is a direct continuation of Proto-Indo-European '' *oḱtṓ(w)-'', and as such cognate with Greek and Latin , both of which stems are reflected by the English prefix oct(o)-, as in the ordinal adjective ''octaval'' or ''octavary'', the distributive adjective is ''octonary''. The adjective ''octuple'' (Latin ) may also be used as a noun, meaning "a set of eight items"; the diminutive ''octuplet'' is mostly used to refer to eight siblings delivered in one birth. The Semitic numeral is based on a root ''*θmn-'', whence Akkadian ''smn-'', Arabic ''ṯmn-'', Hebrew ''šmn-'' etc. The Chinese numeral, written (Mandarin: ''bā''; Cantonese: ''baat''), is from Old Chinese ''*priāt-'', ultimately from Sino-Tibetan ''b-r-gyat'' or ''b-g-ryat'' which also yielded Tibetan '' brgyat''. It has been argued that, as the cardinal num ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chopper (electronics)
In electronics, a chopper circuit is any of numerous types of electronic switching devices and circuits used in power control and signal applications. A chopper is a device that converts fixed DC input to a variable DC output voltage directly. Essentially, a chopper is an electronic switch that is used to interrupt one signal under the control of another. In power electronics applications, since the switching element is either fully on or fully off, its losses are low and the circuit can provide high efficiency. However, the current supplied to the load is discontinuous and may require smoothing or a high switching frequency to avoid undesirable effects. In signal processing circuits, use of a chopper stabilizes a system against drift of electronic components; the original signal can be recovered after amplification or other processing by a synchronous demodulator that essentially un-does the "chopping" process. Comparison (step down chopper and step up chopper) Comparison b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aluminum
Aluminium (or aluminum in North American English) is a chemical element; it has chemical symbol, symbol Al and atomic number 13. It has a density lower than that of other common metals, about one-third that of steel. Aluminium has a great affinity towards oxygen, passivation (chemistry), forming a protective layer of aluminium oxide, oxide on the surface when exposed to air. It visually resembles silver, both in its color and in its great ability to reflect light. It is soft, magnetism, nonmagnetic, and ductility, ductile. It has one stable isotope, 27Al, which is highly abundant, making aluminium the abundance of the chemical elements, 12th-most abundant element in the universe. The radioactive decay, radioactivity of aluminium-26, 26Al leads to it being used in radiometric dating. Chemically, aluminium is a post-transition metal in the boron group; as is common for the group, aluminium forms compounds primarily in the +3 oxidation state. The aluminium cation Al3+ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extruded
Extrusion is a process used to create objects of a fixed cross-sectional profile by pushing material through a die of the desired cross-section. Its two main advantages over other manufacturing processes are its ability to create very complex cross-sections; and to work materials that are brittle, because the material encounters only compressive and shear stresses. It also creates excellent surface finish and gives considerable freedom of form in the design process. Drawing is a similar process, using the tensile strength of the material to pull it through the die. It limits the amount of change that can be performed in one step, so it is limited to simpler shapes, and multiple stages are usually needed. Drawing is the main way to produce wire. Metal bars and tubes are also often drawn. Extrusion may be continuous (theoretically producing indefinitely long material) or semi-continuous (producing many pieces). It can be done with hot or cold material. Commonly extruded mat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alstom
Alstom SA () is a French multinational rolling stock manufacturer which operates worldwide in rail transport markets. It is active in the fields of passenger transportation, signaling, and locomotives, producing high-speed, suburban, regional and urban trains along with trams. The company and its name (originally spelled Alsthom) was formed by a merger between the electric engineering division of Société Alsacienne de Constructions Mécaniques (Als) and Compagnie Française Thomson-Houston (thom) in 1928. Significant acquisitions later included the Constructions Électriques de France (1932), shipbuilder Chantiers de l'Atlantique (1976), and parts of ACEC (late 1980s). A merger with parts of the British General Electric Company formed GEC Alsthom in 1989. Throughout the 1990s, the company expanded its holdings in the rail sector, acquiring German rolling stock manufacturer Linke-Hofmann-Busch and Italian rail signaling specialist Sasib Railways. In 1998, GEC Alsthom was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pistoia
Pistoia (; ) is a city and ''comune'' in the Italian region of Tuscany, the capital of a province of the same name, located about north-west of Florence and is crossed by the Ombrone Pistoiese, a tributary of the River Arno. It is a typical Italian medieval city, and it attracts many tourists, especially in the summer. The city is famous throughout Europe for its plant nurseries. History ''Pistoria'' (in Latin other possible forms are ''Pistorium'' or ''Pistoriae'') was a centre of Gallic, Ligurian and Etruscan settlements before becoming a Roman colony in the 6th century BC, along the important road Via Cassia: in 62 BC the demagogue Catiline and his fellow conspirators were slain nearby. From the 5th century the city was a bishopric, and during the Lombardic kingdom it was a royal city and had several privileges. Pistoia's most splendid age began in 1177 when it proclaimed itself a free commune: in the following years it became an important political centre, ere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Società Italiana Ernesto Breda
Società Italiana Ernesto Breda (), more usually referred to simply as Breda, was an Italian mechanical manufacturing company founded by Ernesto Breda in Milan in 1886. History The firm was founded by Ernesto Breda in Milan in 1886. It originally manufactured locomotives and other railway machinery, but later branched out into armaments and aircraft. Occasionally, not continuously, the company also built trolleybuses. In 1935, it acquired the railway division of Officine Ferroviarie Meridionali and, soon afterwards, the aircraft division of the same company. Breda-designed machine guns such as the Breda Model 30 and Breda Model 37 were standard issue weapons for the Royal Italian Army during the Second Italo-Abyssinian War, the Italian Invasion of Albania and World War 2. At the peak of its wartime production, the company had 26,000 employees. By 1954, its workforce had been reduced to around 8,000. In 1962, Breda was nationalised as part of EFIM, but was liquidated in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fort Totten Station
Fort Totten station is a Washington Metro station in northeastern Washington, D.C. It is one of the four major transfer points on the Metrorail system. It acts as a transfer point between the Green and Red Lines. It is the last station on the Green Line in the District of Columbia before heading into Maryland and the second to last for the Red Line. It is one of two stations (the other being Arlington Cemetery) with three levels (the entrance and exit are on the second floor between the three lines), and is doubly unique in being the only multi-level transfer station built above ground and being the only such station to have island platforms on both levels, as opposed to just the lower level. The station's 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. The station is located in the middle of Fort Totten Park in Northeast, serving the neighborhoods of Fort Totten to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WMATA Orange
The Washington Metropolitan Area Transit Authority (WMATA ), commonly referred to as Metro, is a tri-jurisdictional public transit agency that operates transit services in the Washington metropolitan area. WMATA provides rapid transit service under the Metrorail name, fixed-route bus service under the Metrobus brand, and paratransit service under the MetroAccess brand. In , the system had a ridership of , or about per weekday as of . The agency participates in regional transportation planning and the execution of transit infrastructure projects. Recent projects include an infill station serving Potomac Yard and an extension of Metrorail to Dulles International Airport. WMATA was created in the late 1960s by the United States Congress as an interstate compact between Washington, D.C., Maryland, and Virginia. The authority's board of directors consists of two voting representatives each from the District of Columbia, Maryland, Virginia, and the U.S. federal government. Each ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WMATA Silver
The Washington Metropolitan Area Transit Authority (WMATA ), commonly referred to as Metro, is a tri-jurisdictional public transport, public transit agency that operates transit services in the Washington metropolitan area. WMATA provides rapid transit service under the Washington Metro, Metrorail name, fixed-route bus service under the Metrobus (Washington, D.C.), Metrobus brand, and paratransit service under the MetroAccess brand. In , the system had a ridership of , or about per weekday as of . The agency participates in regional transportation planning and the execution of transit infrastructure projects. Recent projects include an Potomac Yard station, infill station serving Potomac Yard and an Silver Line (Washington Metro), extension of Metrorail to Dulles International Airport. WMATA was created in the late 1960s by the United States Congress as an interstate compact between Washington, D.C., Maryland, and Virginia. The authority's board of directors consists of two v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WMATA Red
The Washington Metropolitan Area Transit Authority (WMATA ), commonly referred to as Metro, is a tri-jurisdictional public transit agency that operates transit services in the Washington metropolitan area. WMATA provides rapid transit service under the Metrorail name, fixed-route bus service under the Metrobus brand, and paratransit service under the MetroAccess brand. In , the system had a ridership of , or about per weekday as of . The agency participates in regional transportation planning and the execution of transit infrastructure projects. Recent projects include an infill station serving Potomac Yard and an extension of Metrorail to Dulles International Airport. WMATA was created in the late 1960s by the United States Congress as an interstate compact between Washington, D.C., Maryland, and Virginia. The authority's board of directors consists of two voting representatives each from the District of Columbia, Maryland, Virginia, and the U.S. federal government. Each j ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
