1.
Commuter rail
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Trains operate following a schedule, at speeds varying from 50 to 200 km/h. Distance charges or zone pricing may be used and they primarily serve lower density suburban areas, and often share right-of-way with intercity or freight trains. Some services operate only during peak hours and others uses fewer departures during off peak hours, average speeds are high, often 50 km/h or higher. These higher speeds better serve the longer distances involved, some services include express services which skip some stations in order to run faster and separate longer distance riders from short-distance ones. The general range of commuter trains distance varies between 15 and 200 km, sometimes long distances can be explained by that the train runs between two or several cities. Distances between stations may vary, but are much longer than those of urban rail systems. In city centers the train either has a station or passes through the city centre with notably fewer station stops than those of urban rail systems. Toilets are often available on trains and in stations. Their ability to coexist with freight or intercity services in the same right-of-way can drastically reduce system construction costs, however, frequently they are built with dedicated tracks within that right-of-way to prevent delays, especially where service densities have converged in the inner parts of the network. Most such trains run on the standard gauge track. Some light rail systems may run on a narrower gauge, some countries, including Finland, India, Pakistan, Russia, Brazil and Sri Lanka, as well as San Francisco in the USA and Melbourne and Adelaide in Australia, use broad gauge track. The fact that the terminology is not standardised across countries further complicates matters, most S-bahns typically behave like commuter rail with most trackage not separated from other trains, and long lines with trains running between cities and suburbs rather than within a city. The distances between stations however, are usually short, in larger systems there is usually a high frequency metro-like central corridor in the city center where all the lines converge into. Typical examples of large city S-Bahns include Munich and Frankfurt, S-Bahns do also exist in some mid-size cities like Rostock and Magdeburg but behave more like typical commuter rail with lower frequencies and very little exclusive trackage. A similar network exists in Copenhagen called the S-tog, in Hamburg and Copenhagen, other, diesel driven trains, do continue where the S-Bahn ends. Regional rail usually provides rail services between towns and cities, rather than purely linking major population hubs in the way inter-city rail does, Regional rail operates outside major cities. Unlike Inter-city, it stops at most or all stations between cities and it provides a service between smaller communities along the line, and also connections with long-distance services at interchange stations located at junctions or at larger towns along the line. Alternative names are local train or stopping train, examples include the former BRs Regional Railways, Frances TER, Germanys DB Regio and South Koreas Tonggeun services
2.
Regional Transportation District
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It operates over a 2, 340-square-mile area, serving 2.87 million people. RTD is governed by a 15-member, publicly elected Board of Directors, Directors are elected to a four-year term and represent a specific district of about 180,000 constituents. RTD currently operates a bus and rail system that has an area of 2,337 square miles. It employed 2,734 people and reported 103 million boardings in 2016 and it had a $466.7 million operating budget for the year of 2015. Google has RTD schedules attached to its trip planner, and 3rd party mobile applications are now available for the iPhone,1969, RTD was created in the 47th session of the Colorado General Assembly to provide public transportation to five additional counties in the metropolitan area. 1969–1971, The Denver Tramway Company continues service under sponsorship of the City and County of Denver, October 1970, RTD found it needed to establish a Northern Operations Group to provide service to Boulder and Longmont. RTD also acquired the privately owned Denver-Boulder Bus Company, which ran airport buses,1971, Denver Metro Transit took over the privately owned Denver Tramway Company. Denver Metro Transit was an entity created by the City and County of Denver, suburban service only continued for those suburbs willing to contribute a subsidy. 1972, RTD created a plan for a rapid transit system in the area. This plan included 98 miles of PRT and extensive bus service throughout the areas served by RTD, later that year, the Urban Mass Transportation Administration selected RTD to develop PRT as a demonstration project. The PRT project was eventually scrapped, the tax became effective January 1,1974. July 1974, Denver Metro Transit became part of RTD, 1975–1977, RTD consolidated, expanded, and improved service frequency. Service was expanded to routes that commercial carriers previously operated, february 1978, Inflation caused RTD to implement a new fare structure. For instances, the new Colorado Blvd route was number 40,1979, Federal approval was granted for the 16th Street Mall in downtown Denver, originally known as Transitway. The project allowed express bus productivity to double and was intersected by RTDs first light rail line. 1980, RTD reached a number of weekday passengers. It also acquired 216 new buses,89 of which were articulated, construction began on the 16th Street Mall. Work was also completed to make RTDs service more accessible to elderly,1983, On May 1,1983, the tax was increased to 0. 6%
3.
Denver metropolitan area
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Denver is the central city of a conurbation region in the U. S. state of Colorado. The conurbation includes one continuous region consisting of the six counties of Adams, Arapahoe, Broomfield, Denver, Douglas. The Denver region is part of the Front Range Urban Corridor, the continuously urbanized area extends northwest into the City and County of Broomfield, bordering Jefferson and Adams counties, and south into Douglas County, adjoining Arapahoe County. Also included in the federally defined MSA are four counties, Elbert County on the southeastern prairie and Clear Creek, Gilpin. The Denver-Aurora-Lakewood Metropolitan Statistical Area comprises ten counties, in 2005 the RTD developed a twelve-year comprehensive plan, called FasTracks, to build and operate rail transit lines and expand and improve bus service throughout the region. Electricity is provided by Xcel Energy, cable television is provided by Comcast. Severity of pollution in this area has varied enormously over the years, in the late 1980s the area was frequently in violation of multiple National Ambient Air Quality Standards established by the United States Environmental Protection Agency. The Regional Air Quality Council was formed in 1989 to create plans to address the problem, through a variety of measures the areas air quality was improved and in 2002 the EPA designated the area in compliance with all federal health-based air quality standards. Denver was the first major city in the United States to reach compliance with all six of these standards after previously violating five of them, since then the EPA introduced a new standard for small particulates and made the existing ozone standard stricter. In 2003 the new standard was frequently exceeded in the area and was occasionally exceeded as far away as Rocky Mountain National Park. The RAQC hopes to implement plans enabling the area to comply with the new standards by 2007. S
4.
Denver Union Station
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Denver Union Station is the main railway station and central transportation hub in Denver, Colorado. A station opened on the site June 1,1881, burning in 1894, the current structure was erected in two stages, with an enlarged central portion completed in 1914. In 2012, the station underwent a major renovation transforming it into the centerpiece of a new transit-oriented mixed-use development built on the sites former rail-yards. The station house re-opened in the summer of 2014 as a combination of the 112-room Crawford Hotel, several restaurants and retailers, and a train hall. Denvers first train station was constructed in 1868 to serve the new Denver Pacific Railway, by 1875, there were four different railroad stations, making passenger transfers between different railroad lines inconvenient. To remedy this issue, the Union Pacific Railroad proposed creating one central Union Station to combine the various operations, in February 1880, the owners of the four lines agreed to build a station at 17th and Wynkoop Streets. Architect A. Taylor of Kansas City was hired to develop the plans, however, a fire that started in the womens restroom in 1894 destroyed the central portion of the 1881 depot. The Kansas City architectural firm of Van Brunt & Howe was hired to design a replacement depot in the Romanesque Revival style. Both the 1881 and 1894 depots included a central clock tower with four clock faces. On July 4,1906, an arch was dedicated in front of the station in order to provide a symbolic threshold for travelers entering and leaving the city. Constructed at a cost of $22,500 with 70 tons of steel and over 2,000 light bulbs, the arch originally featured the word Welcome on both sides. However, the elevation facing 17th Street was changed to Mizpah, in 1912, the original Union Depot partnership was dissolved and replaced by the Denver Terminal Railway Company, representing the then-major operators of the station. The new partnership decided to demolish and rebuild the portion of the station to handle the increasing passenger traffic. The new central portion, designed by Denver architects Gove & Walsh, was built in the Beaux-Arts style, as a result of growing passenger service, the Mizpah Arch in front of the station was deemed a traffic hazard and was torn down in 1931. For the first time in 1958, passenger traffic at Stapleton International Airport exceeded that of Union Station and it was during this period that the orange Union Station, Travel by Train signs were placed on both sides of the building in order to advertise intercity rail travel. Amtrak eventually became the provider of rail service through the station. Until the grand renovation, the served the annual Cheyenne Frontier Days Train. The popular excursion train has since been based at a site near the Denver Coliseum, the plan was approved by the Partner Agencies in 2004 and was approved by voters in November of that year as the new FasTracks program
5.
Track gauge
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In rail transport, track gauge is the spacing of the rails on a railway track and is measured between the inner faces of the load-bearing rails. All vehicles on a network must have running gear that is compatible with the track gauge, as the dominant parameter determining interoperability, it is still frequently used as a descriptor of a route or network. There is a distinction between the gauge and actual gauge at some locality, due to divergence of track components from the nominal. Railway engineers use a device, like a caliper, to measure the actual gauge, the nominal track gauge is the distance between the inner faces of the rails. In current practice, it is specified at a distance below the rail head as the inner faces of the rail head are not necessarily vertical. In some cases in the earliest days of railways, the company saw itself as an infrastructure provider only. Colloquially the wagons might be referred to as four-foot gauge wagons, say and this nominal value does not equate to the flange spacing, as some freedom is allowed for. An infrastructure manager might specify new or replacement track components at a variation from the nominal gauge for pragmatic reasons. Track is defined in old Imperial units or in universally accepted metric units or SI units, Imperial units were established in United Kingdom by The Weights and Measures Act of 1824. In addition, there are constraints, such as the load-carrying capacity of axles. Narrow gauge railways usually cost less to build because they are lighter in construction, using smaller cars and locomotives, as well as smaller bridges, smaller tunnels. Narrow gauge is often used in mountainous terrain, where the savings in civil engineering work can be substantial. Broader gauge railways are generally expensive to build and require wider curves. There is no single perfect gauge, because different environments and economic considerations come into play, a narrow gauge is superior if ones main considerations are economy and tight curvature. For direct, unimpeded routes with high traffic, a broad gauge may be preferable, the Standard, Russian, and 46 gauges are designed to strike a reasonable balance between these factors. In addition to the general trade-off, another important factor is standardization, once a standard has been chosen, and equipment, infrastructure, and training calibrated to that standard, conversion becomes difficult and expensive. This also makes it easier to adopt an existing standard than to invent a new one and this is true of many technologies, including railroad gauges. The reduced cost, greater efficiency, and greater economic opportunity offered by the use of a common standard explains why a number of gauges predominate worldwide
6.
Standard gauge
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The standard gauge is a widely used railway track gauge. Approximately 55% of the lines in the world are this gauge, all high-speed rail lines, except those in Russia, Uzbekistan, and Finland, are standard gauge. The distance between the edges of the rails is defined to be 1435 mm except in the United States. It is also called the UIC gauge or UIC track gauge, as railways developed and expanded, one of the key issues was the track gauge to be used. The result was the adoption throughout a large part of the world of a gauge of 1435 mm. In North East England, some lines in colliery areas were 4 ft 8 in. All these lines had been widened to standard gauge by 1846, parts of the United States, mainly in the Northeast, adopted the same gauge, because some early trains were purchased from Britain. However, until well into the half of the 19th century, Britain. The American gauges converged as the advantages of equipment interchange became increasingly apparent, notably, all the 5 ft broad gauge track in the South was converted to standard gauge over the course of two days beginning on 31 May 1886. See Track gauge in the United States, snopes categorized this legend as false, but commented that. It is perhaps more fairly labelled as True, but for trivial, the historical tendency to place the wheels of horse-drawn vehicles approximately 5 feet apart probably derives from the width needed to fit a carthorse in between the shafts. Others were 4 ft 4 in or 4 ft 7 1⁄2 in, the English railway pioneer George Stephenson spent much of his early engineering career working for the coal mines of County Durham. He favoured 4 ft 8 in for wagonways in Northumberland and Durham, the Hetton and Springwell wagonways also used this gauge. Stephensons Stockton and Darlington railway was primarily to transport coal from mines near Shildon to the port at Stockton-on-Tees. The initial gauge of 4 ft 8 in was set to accommodate the existing gauge of hundreds of horse-drawn chaldron wagons that were already in use on the wagonways in the mines. The railway used this gauge for 15 years before a change was made to 4 ft 8 1⁄2 in gauge, George Stephenson used the 4 ft 8 1⁄2 in gauge for the Liverpool and Manchester Railway, authorised in 1826 and opened 30 September 1830. The success of this led to Stephenson and his son Robert being employed to engineer several other larger railway projects. Monkland and Kirkintilloch Railway, authorised 1824 and opened 1825, used 4 ft 6 in, Dundee and Newtyle Railway, authorised 1829 and opened 1831, used 4 ft 6 1⁄2 in
7.
Railway electrification system
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A railway electrification system supplies electric power to railway trains and trams without an on-board prime mover or local fuel supply. Electrification has many advantages but requires significant capital expenditure, selection of an electrification system is based on economics of energy supply, maintenance, and capital cost compared to the revenue obtained for freight and passenger traffic. Different systems are used for urban and intercity areas, some electric locomotives can switch to different supply voltages to allow flexibility in operation, Electric railways use electric locomotives to haul passengers or freight in separate cars or electric multiple units, passenger cars with their own motors. Electricity is typically generated in large and relatively efficient generating stations, transmitted to the railway network, some electric railways have their own dedicated generating stations and transmission lines but most purchase power from an electric utility. The railway usually provides its own lines, switches and transformers. Power is supplied to moving trains with a continuous conductor running along the track usually takes one of two forms. The first is a line or catenary wire suspended from poles or towers along the track or from structure or tunnel ceilings. Locomotives or multiple units pick up power from the wire with pantographs on their roofs that press a conductive strip against it with a spring or air pressure. Examples are described later in this article, the second is a third rail mounted at track level and contacted by a sliding pickup shoe. Both overhead wire and third-rail systems usually use the rails as the return conductor. In comparison to the alternative, the diesel engine, electric railways offer substantially better energy efficiency, lower emissions. Electric locomotives are usually quieter, more powerful, and more responsive and they have no local emissions, an important advantage in tunnels and urban areas. Different regions may use different supply voltages and frequencies, complicating through service, the limited clearances available under catenaries may preclude efficient double-stack container service. Possible lethal electric current due to risk of contact with high-voltage contact wires, overhead wires are safer than third rails, but they are often considered unsightly. These are independent of the system used, so that. The permissible range of voltages allowed for the voltages is as stated in standards BS EN50163. These take into account the number of trains drawing current and their distance from the substation, railways must operate at variable speeds. Until the mid 1980s this was only practical with the brush-type DC motor, since such conversion was not well developed in the late 19th century and early 20th century, most early electrified railways used DC and many still do, particularly rapid transit and trams
8.
Overhead line
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An overhead line or overhead wire is used to transmit electrical energy to trams, trolleybuses, or trains. Overhead line is designed on the principle of one or more overhead wires situated over rail tracks, the feeder stations are usually fed from a high-voltage electrical grid. Electric trains that collect their current from overhead lines use a device such as a pantograph and it presses against the underside of the lowest overhead wire, the contact wire. Current collectors are electrically conductive and allow current to flow through to the train or tram, non-electric locomotives may pass along these tracks without affecting the overhead line, although there may be difficulties with overhead clearance. Alternative electrical power transmission schemes for trains include third rail, ground-level power supply, batteries and this article does not cover regenerative braking, where the traction motors act as generators to retard movement and return power to the overhead. To achieve good high-speed current collection, it is necessary to keep the wire geometry within defined limits. This is usually achieved by supporting the wire from a second wire known as the messenger wire or catenary. This wire approximates the path of a wire strung between two points, a catenary curve, thus the use of catenary to describe this wire or sometimes the whole system. This wire is attached to the wire at regular intervals by vertical wires known as droppers or drop wires. It is supported regularly at structures, by a pulley, link, the whole system is then subjected to a mechanical tension. As the contact wire makes contact with the pantograph, the insert on top of the pantograph is worn down. The straight wire between supports will cause the wire to cross over the whole surface of the pantograph as the train travels around the curve, causing uniform wear. On straight track, the wire is zigzagged slightly to the left. The movement of the wire across the head of the pantograph is called the sweep. The zigzagging of the line is not required for trolley poles. Depot areas tend to have only a wire and are known as simple equipment or trolley wire. When overhead line systems were first conceived, good current collection was only at low speeds. Compound equipment - uses a second wire, known as the auxiliary
9.
Volt
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The volt is the derived unit for electric potential, electric potential difference, and electromotive force. One volt is defined as the difference in potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. It is also equal to the difference between two parallel, infinite planes spaced 1 meter apart that create an electric field of 1 newton per coulomb. Additionally, it is the difference between two points that will impart one joule of energy per coulomb of charge that passes through it. It can also be expressed as amperes times ohms, watts per ampere, or joules per coulomb, for the Josephson constant, KJ = 2e/h, the conventional value KJ-90 is used, K J-90 =0.4835979 GHz μ V. This standard is typically realized using an array of several thousand or tens of thousands of junctions. Empirically, several experiments have shown that the method is independent of device design, material, measurement setup, etc. in the water-flow analogy sometimes used to explain electric circuits by comparing them with water-filled pipes, voltage is likened to difference in water pressure. Current is proportional to the diameter of the pipe or the amount of water flowing at that pressure. A resistor would be a reduced diameter somewhere in the piping, the relationship between voltage and current is defined by Ohms Law. Ohms Law is analogous to the Hagen–Poiseuille equation, as both are linear models relating flux and potential in their respective systems, the voltage produced by each electrochemical cell in a battery is determined by the chemistry of that cell. Cells can be combined in series for multiples of that voltage, mechanical generators can usually be constructed to any voltage in a range of feasibility. High-voltage electric power lines,110 kV and up Lightning, Varies greatly. Volta had determined that the most effective pair of metals to produce electricity was zinc. In 1861, Latimer Clark and Sir Charles Bright coined the name volt for the unit of resistance, by 1873, the British Association for the Advancement of Science had defined the volt, ohm, and farad. In 1881, the International Electrical Congress, now the International Electrotechnical Commission and they made the volt equal to 108 cgs units of voltage, the cgs system at the time being the customary system of units in science. At that time, the volt was defined as the difference across a conductor when a current of one ampere dissipates one watt of power. The international volt was defined in 1893 as 1/1.434 of the emf of a Clark cell and this definition was abandoned in 1908 in favor of a definition based on the international ohm and international ampere until the entire set of reproducible units was abandoned in 1948. Prior to the development of the Josephson junction voltage standard, the volt was maintained in laboratories using specially constructed batteries called standard cells
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Amtrak