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Washington Metro Rolling Stock
The rolling stock of the Washington Metro system consists of 1,318 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 and operate in groups of 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 owned a fleet of 1,318 cars, 1,286 of which were in active revenue service. ''In the "Active railcars" table, font in bold represents the railcars that are currently in service while the regular font in the other tables represent cars that are retired or on order.'' Rail yards There are nine Metrorail storage and overhaul facilities totaling more than 1.3 million square feet of workspace. One is ... [...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, freight and passenger cars (or coaches), and non-revenue cars. Passenger vehicles can be un-powered, or self-propelled, single or multiple units. A connected series of railway vehicles is a train (this term applied to a locomotive is a common misnomer). In North America, Australia and other countries, the term consist ( ) is used to refer to the rolling stock in a train. 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 shipped to the buyer without much cost or delay. The term contrasts with fixed stock (infrastru ... [...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 government agency that operates transit service in the Washington metropolitan area. WMATA was created by the United States Congress as an interstate compact between Washington, D.C., the State of Maryland, and the Commonwealth of Virginia. 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 authority is also part of a public–private partnership that operates the DC Circulator bus system. WMATA has its own police force, the Metro Transit Police Department. 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 jurisdiction also appoints two alternate representatives. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Induction Motor
An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be made without electrical connections to the rotor. An induction motor's rotor can be either wound type or squirrel-cage type. Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFD) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable-frequency Drive
A variable-frequency drive (VFD) is a type of motor drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and, depending on topology, to control associated voltage or current variation., quote is per definition on p. 4 of NEMA Standards Publication ICS 7.2-2021. VFDs may also be known as 'AFDs' (adjustable-frequency drives), 'ASDs' (adjustable-speed drives), 'VSDs' (variable-speed drives), 'AC drives', 'micro drives', 'inverter drives' or, simply, 'drives'. VFDs are used in applications ranging from small appliances to large compressors. An increasing number of end users are showing greater interest in electric drive systems due to more stringent emission standards and demand for increased reliability and better availability. Systems using VFDs can be more efficient than those using throttling control of fluid flow, such as in systems with pumps and damper control for fans. However, the global market penetration fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Insulated-gate Bipolar Transistor
An insulated-gate bipolar transistor (IGBT) is a three-terminal power semiconductor device primarily used as an electronic switch, which, as it was developed, came to combine high efficiency and fast switching. It consists of four alternating layers (P–N–P–N) that are controlled by a metal–oxide–semiconductor (MOS) gate structure. Although the structure of the IGBT is topologically the same as a thyristor with a "MOS" gate ( MOS-gate thyristor), the thyristor action is completely suppressed, and only the transistor action is permitted in the entire device operation range. It is used in switching power supplies in high-power applications: variable-frequency drives (VFDs), electric cars, trains, variable-speed refrigerators, lamp ballasts, arc-welding machines, induction hobs, and air conditioners. Since it is designed to turn on and off rapidly, the IGBT can synthesize complex waveforms with pulse-width modulation and low-pass filters, so it is also used in switching ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aluminum
Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It has a great affinity towards oxygen, and forms a protective layer of oxide on the surface when exposed to air. Aluminium visually resembles silver, both in its color and in its great ability to reflect light. It is soft, non-magnetic and ductile. It has one stable isotope, 27Al; this isotope is very common, making aluminium the twelfth most common element in the Universe. The radioactivity of 26Al is used in radiodating. 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+ is small and highly charged; as such, it is polarizing, and bonds aluminium forms tend towards covalency. The strong affinity towards ox ... [...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 materials ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alstom
Alstom SA is a French multinational rolling stock manufacturer operating worldwide in rail transport markets, active in the fields of passenger transportation, signalling, and locomotives, with products including the AGV, TGV, Eurostar, Avelia and New Pendolino high-speed trains, in addition to suburban, regional and metro trains, and Citadis trams. Alsthom (originally Als-Thom) was formed by a merger between Compagnie Française Thomson-Houston and the electric engineering division of Société Alsacienne de Constructions Mécaniques in 1928. Significant later acquisitions included the Constructions Electriques de France (1932), shipbuilder Chantiers de l'Atlantique (1976), and parts of ACEC (Belgium, late-1980s). A merger with parts of the General Electric Company (UK) formed GEC Alsthom in 1989. Throughout the 1990s, the company expanded its holdings in the rail sector, via the acquisition of German rolling stock manufacturer Linke-Hofmann-Busch and Italian rail signall ... [...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 west and north 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, erectin ... [...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 the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WMATA Blue
The Washington Metropolitan Area Transit Authority (WMATA ), commonly referred to as Metro, is a tri-jurisdictional government agency that operates transit service in the Washington metropolitan area. WMATA was created by the United States Congress as an interstate compact between Washington, D.C., the U.S. state, State of Maryland, and the Commonwealth (U.S. state), Commonwealth of Virginia. 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 authority is also part of a public–private partnership that operates the DC Circulator bus system. WMATA has its own police force, the Metro Transit Police Department. The authority's board of directors consists of two voting representatives each from the District of Columbia, Maryland, Virginia, and the U. ... [...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 government agency that operates transit service in the Washington metropolitan area. WMATA was created by the United States Congress as an interstate compact between Washington, D.C., the State of Maryland, and the Commonwealth of Virginia. 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 authority is also part of a public–private partnership that operates the DC Circulator bus system. WMATA has its own police force, the Metro Transit Police Department. 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 jurisdiction also appoints two alternate representatives. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
