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.
Inter-city rail
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Inter-city rail services are express passenger train services that cover longer distances than commuter or regional trains. There is no definition of inter-city rail, its meaning may vary from country to country. Most typically, an inter-city train is a train with limited stops. Inter-city rail sometimes provides international services and this is most prevalent in Europe, due to the close proximity of its 50 countries in a 10,180,000 square kilometre area. Eurostar and EuroCity are examples of this and this use of the term appeared in the United Kingdom in the 1960s and has been widely imitated. The speeds of inter-city rail lines are diverse, ranging from 50 km/h in a mountainous area or on undeveloped tracks to 200–350 km/h on newly constructed or improved tracks. As a result, Inter-city rail may or may not fall into the category of higher-speed rail or high-speed rail, ideally, the average speed of inter-city rail service would be faster than 100 km/h in order to be competitive with car, bus and other methods of transport. 50–100 km The distance of an inter-city rail journey is usually at least 50–100 km, although in large metropolitan areas commuter. 100–500 km A distance of 100–500 km is a common journey distance for inter-city rail in many countries, in many cases, railway travel is most competitive at about 2–3 hours journey time. Inter-city rail can compete with highways and short-haul air travel for journeys of this distance. 500–1,000 km In journeys of 500–1,000 km, development of high-speed rail in some countries increases the share of railway for such longer-distance journeys. The Paris-Marseille TGV and Tokyo-Aomori Shinkansen are examples of type of journey. In conventional non high-speed rail, overnight trains are common for this distance, in many other countries, such long-distance rail journey has been replaced by air travel except for tourism or hobbyist purposes, luxury train journeys, or significant cost benefit. Discount Eurail Pass in Europe, Amtrak in the United States, New high-speed lines from 200–350 km/h operation are constructed, and many conventional lines are also upgraded to 200 km/h operation. Currently there are seven High-Speed Inter-City lines in China, with up to 21 planned and they are operated independently from the often parallel High-Speed-Rail-Lines. Japan has six main regional railway companies, known collectively as Japan Railways Group or simply as JR. Many other cities are covered by a network of JRs limited express inter-city trains on 1,067 mm, narrow gauge, major cities are covered by convenient train services of every one hour or more frequent. In addition to the JR Group, Japan has several major regional carriers such as the Kintetsu, almost every major town and city in South Korea is linked by railway, run by Korail
3.
Double-track railway
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A double-track railway usually involves running one track in each direction, compared to a single-track railway where trains in both directions share the same track. In the earliest days of railways in the United Kingdom, most lines were built as double-track because of the difficulty of co-ordinating operations before the invention of the telegraph, the lines also tended to be busy enough to be beyond the capacity of a single track. In the early days the Board of Trade did not consider any single-track railway line to be complete and this improved with the development of the telegraph and the train order system. In any given country, rail traffic generally runs to one side of a double-track line, thus in Belgium, China, France, Sweden, Switzerland and Italy for example, the railways use left-hand running, while the roads use right-hand running. In countries such as Indonesia, it is the reverse, on the French-German border, for example, flyovers were provided so that train moving on the left in France end up on the right in Germany and vice versa. Handedness of traffic can affect locomotive design, for the driver, visibility is good from both sides of the driving cab so the choice on which side to site the driver less important. For example, the French SNCF Class BB7200 is designed for using the left-hand track, generally, the left/right principle in a country is followed mostly on double track. On single track, when trains meet, the train that shall not stop uses the straight path in the turnout. Double-track railways, especially older ones, may use each track exclusively in one direction and this arrangement simplifies the signalling systems, especially where the signalling is mechanical. Where the signals and points or rail switches are power-operated, it can be worthwhile to signal each line in both directions, so that the line becomes a pair of single lines. This allows trains to use one track where the track is out of service due to track maintenance work, or a train failure. Most crossing loops are not regarded as even though they consist of multiple tracks. If the crossing loop is long enough to several trains. A more modern British term for such a layout is an extended loop, the distance between the track centres makes a difference in cost and performance of a double-track line. The track centres can be as narrow and as cheap as possible, signals for bi-directional working cannot be mounted between the tracks so must be mounted on the wrong side of the line or on expensive signal bridges. Track centres are usually wider on high speed lines, as pressure waves knock each other as high-speed trains pass, narrow track centres might be 4 metres or less. Narrow track centres may have to be widened on sharp curves to allow for rail vehicles following the arc of the curve. Widening a track centre to 5 metres or so suits high-speed trains passing each other, increasing width of track centres of 6 metres or more makes it much easier to mount signals and overhead wiring structures
4.
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
5.
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
6.
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
7.
Seoul
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The Seoul Capital Area houses up to half of the countrys population of 50.22 million people with 678,102 international residents. Situated on the Han River, Seouls history stretches back more than two years when it was founded in 18 BCE by Baekje, one of the Three Kingdoms of Korea. It continued as the capital of Korea under the Joseon Dynasty, the Seoul Capital Area contains five UNESCO World Heritage Sites, Changdeok Palace, Hwaseong Fortress, Jongmyo Shrine, Namhansanseong and the Royal Tombs of the Joseon Dynasty. Seoul is surrounded by mountains, the tallest being Mt. Bukhan, in 2015, it was rated Asias most livable city with the second highest quality of life globally by Arcadis. In 2014, the citys GDP per capita of $39,786 was comparable to that of France and Finland. Ranked sixth in the Global Power City Index and Global Financial Centres Index, Seoul is the worlds most wired city and ranked first in technology readiness by PwCs Cities of Opportunity report. It is served by the KTX high-speed rail and the Seoul Subway, providing 4G LTE, WiFi, Seoul is connected via AREX to Incheon International Airport, rated the worlds best airport nine years in a row by Airports Council International. Lotte World Tower, a 556-metre supertall skyscraper with 123 floors, has built in Seoul and become the OECDs tallest in 2016. Its Lotte Cinema houses the worlds largest cinema screen, Seouls COEX Mall is the worlds largest underground shopping mall. Seoul hosted the 1986 Asian Games,1988 Summer Olympics,2002 FIFA World Cup, the Miss Universe 1980 pageant, a UNESCO City of Design, Seoul was named the 2010 World Design Capital. The city has known in the past by the names Wirye-seong, Hanju. During Japans annexation in Korea, Hanseong was renamed to Keijō by the Imperial authorities to prevent confusion with the hanja 漢, in reality, the ancient name of Seoul, Hanseong, originally had the meaning of big or vast. Its current name originated from the Korean word meaning city, which is believed to be derived from the word Seorabeol, which originally referred to Gyeongju. Unlike most place names in Korea, Seoul has no corresponding hanja, on January 18,2005, Seoul government officially changed its official Chinese language name to Shouer from the historic Hancheng, of which use is becoming less common. Settlement of the Han River area, where present-day Seoul is located, Seoul is first recorded as Wiryeseong, the capital of Baekje in the northeastern Seoul area. There are several city walls remaining in the area date from this time. Pungnaptoseong, a wall just outside Seoul, is widely believed to have been at the main Wiryeseong site. As the Three Kingdoms competed for this region, control passed from Baekje to Goguryeo in the 5th century
8.
Alternating current
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Alternating current, is an electric current which periodically reverses direction, whereas direct current flows only in one direction. A common source of DC power is a cell in a flashlight. The abbreviations AC and DC are often used to mean simply alternating and direct, the usual waveform of alternating current in most electric power circuits is a sine wave. In certain applications, different waveforms are used, such as triangular or square waves, audio and radio signals carried on electrical wires are also examples of alternating current. These types of alternating current carry information encoded onto the AC signal and these currents typically alternate at higher frequencies than those used in power transmission. Electrical energy is distributed as alternating current because AC voltage may be increased or decreased with a transformer, use of a higher voltage leads to significantly more efficient transmission of power. The power losses in a conductor are a product of the square of the current and this means that when transmitting a fixed power on a given wire, if the current is halved, the power loss will be four times less. Power is often transmitted at hundreds of kilovolts, and transformed to 100–240 volts for domestic use, high voltages have disadvantages, such as the increased insulation required, and generally increased difficulty in their safe handling. In a power plant, energy is generated at a convenient voltage for the design of a generator, near the loads, the transmission voltage is stepped down to the voltages used by equipment. Consumer voltages vary somewhat depending on the country and size of load, the voltage delivered to equipment such as lighting and motor loads is standardized, with an allowable range of voltage over which equipment is expected to operate. Standard power utilization voltages and percentage tolerance vary in the different mains power systems found in the world, high-voltage direct-current electric power transmission systems have become more viable as technology has provided efficient means of changing the voltage of DC power. HVDC systems, however, tend to be expensive and less efficient over shorter distances than transformers. Three-phase electrical generation is very common, the simplest way is to use three separate coils in the generator stator, physically offset by an angle of 120° to each other. Three current waveforms are produced that are equal in magnitude and 120° out of phase to each other, if coils are added opposite to these, they generate the same phases with reverse polarity and so can be simply wired together. In practice, higher pole orders are commonly used, for example, a 12-pole machine would have 36 coils. The advantage is that lower rotational speeds can be used to generate the same frequency, for example, a 2-pole machine running at 3600 rpm and a 12-pole machine running at 600 rpm produce the same frequency, the lower speed is preferable for larger machines. If the load on a system is balanced equally among the phases. Even in the worst-case unbalanced load, the current will not exceed the highest of the phase currents
9.
Seoul Ring Expressway
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The Seoul Ring Expressway is an expressway, circular beltway or ring road around Seoul, South Korea. It connects satellite cities around Seoul, Ilsan, Namyangju, Hanam, Pyeongchon, Jungdong, Bundang, Pangyo, Sanbon, Seoul Ring Expressway is currently under construction to widen the expressway between Anhyeon Junction to Seongnam which is expected to be finished in 2016. Since 2010, Gyeonggi Loop Bus connect the many Satellite town to each other through this Expressway, february 1988, Construction Begin of Pangyo to Toegyewon. 29 November 1991, Pangyo to Toegyewon Line opens to traffic, December 1991, Construction Begin of Sanbon to Pangyo. May 1992, Construction Begin of Seoun to Jangsu, December 1992, Construction Begin of Ilsan to Gimpo. June 1995, Construction Begin of Gimpo to Seoun, Jangsu to Sanbon,28 December 1995, Pangyo to Sanbon Line opens to traffic. 3 November 1997, Gimpo to Jayuro Line opens to traffic,24 July 1998, Seoun to Jangsu Line opens to traffic. 26 November 1999, Jangsu to Sanbon, Seoun to Gimpo Line opens to traffic,11 September 2001, Ilsan to Jayuro Line opens to traffic. 30 June 2006, Ilsan to Songchu, Uijeongbu to Toegyewon Line open to traffic,28 December 2007, Songchu to Uijeongbu Line open to traffic. 3 May 2010, Dori JC open to traffic,28 May 2015, Howon IC open to traffic
10.
Gyeonggi Province
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Gyeonggi-do is the most populous province in South Korea. Its name, Gyeonggi means the surrounding capital. Thus Gyeonggi-do can be translated as province surrounding Seoul, seoul—South Koreas largest city and national capital—is in the heart of the province but has been separately administered as a provincial-level special city since 1946. Incheon—South Koreas third largest city—is on the coast of the province and has been administered as a provincial-level metropolitan city since 1981. The three jurisdictions collectively cover 11,730 km2, with a population of 25.6 million—amounting to over half of the entire population of South Korea. Gyeonggi-do has been an important area since 18 BCE, when Korea was divided into three nations during the Three Kingdoms period. Afterward, the current location of Gyeonggi-do, one of the nine states of Later Silla, was called Hansanju, the Gyeonggi region started to rise as the central region of Goryeo as King Taejo of Goryeo set up the capital in Gaesong. Since 1018, this area has been officially called Gyeonggi, since the period of King Taejong and Sejong the Great, the Gyeonggi region has been very similar to the current administrative area of Gyeonggi-do. In 1895 the 23-Bu system, which reorganized administrative areas, was effected, the Gyeonggi region was divided into Hanseong, Incheon, Chungju, Gongju, and Kaesong. During the Japanese colonial period Hanseong-bu was incorporated into Gyeonggi-do, on October 1,1910, it was renamed Keijo and a provincial government was placed in Keijo according to the reorganization of administrative districts. After liberation and the foundation of two Korean governments, Gyeonggi-do and its capital, Seoul, were separated with partial regions of Gyeonggi-do being incorporated into Seoul thereafter. Additionally, Kaesong became North Korean territory, the city to change control after the countries were divided at the 38th parallel. In 1967 the seat of the Gyeonggi provincial government was transferred from Seoul to Suwon, after Incheon separated from Gyeonggi-do in 1981, Gyeonggi regions such as Ongjin County and Ganghwa County were incorporated into Incheon in 1995. Gyeonggi-do is the central region of the Korean Peninsula, which is vertically situated in Northeast Asia and is between east longitude of 126 and 127, and north latitude of 36 and 38. Its dimension is 10% of Korea’s territory,10,171 square kilometres and its provincial government is in Suwon, but some of its government buildings are in Uijeongbu for the administrative conveniences of the northern region. The climate of Gyeonggi-do is the climate, which has a severe differentiation of temperature between summer and winter, and has distinctions of four seasons. Spring is warm, summer is hot and humid, autumn is cool, the annual average temperature is between 11–13 °C, where the temperature in the mountainous areas to the northeast is lower and the coastal areas to the southwest is higher. For January’s average temperature, the Gyeonggi Bay is −4 °C, the Namhangang Basin is −4 – −6 °C, and it becomes colder and higher in temperature differentiation from coastal to inland areas
Bundang
Gyeongui–Jungang
