1.
CRH1
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The total value of the order is €560 million. In July 2010, a further 40 CRH1A eight-car trains were ordered, most CRH1 trains were allocated to Guangshen Railway for replacing all locomotive-hauled trains between Guangzhou and Shenzhen in Guangdong province. Some are also used on the line Shanghai – Nanjing, CRH1A and CRH1B are based on Bombardiers Regina family. The train was designed by Sifang and Bombardier jointly in Västerås, Sweden, the first units （CRH1-001A） were delivered on August 30,2006, the CRH1A sets started service from February 1,2007 at the Guangzhou -Shenzhen Railway. The NG variant is a new model, which will use new materials in order to weight reductions. On October 31,2007, the Chinese MOR ordered 20 sets of CRH1B trains, each CRH1B consists of 16 cars, including 3 first class coaches,12 second class coaches and 1 dining car. On July 23,2011, CRH1-046B was hit on ZY104600 car by CRH2-139E in Yongtaiwen PFL accident. On October 31,2007, the Chinese MOR ordered 20 sets of CRH1E trains. The CRH1E is the first high-speed 16-car sleeper train in the world which is based on Bombardiers ZEFIRO250 km/h design, the train was designed by Bombardier and Zagato. The CRH380D is also derived from the Bombardier Zefiro family of high speed EMUs and are not direct derivatives of the Regina type trains from which the CRH1A. Top speed is advertised at 380 km/h, the 8-car version is designated CRH380D, series number CRH380D-1501 ～ CRH380D-1570
2.
Chengdu
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Chengdu, formerly romanized as Chengtu, is a sub-provincial city which has served as capital of Chinas Sichuan province. It is one of the three most populous cities in Western China, as of 2014 the administrative area houses 14,427,500 inhabitants, with an urban population of 10,152,632. At the time of the 2010 census, Chengdu was the 5th-most populous agglomeration in China, with 10,484,996 inhabitants in the area including Xinjin County. The surrounding Chengdu Plain is also known as the Country of Heaven and its prehistoric settlers included the Sanxingdui culture. It was the capital of Liu Beis Shu during the Three Kingdoms Era, after the fall of Nanjing to the Japanese in 1937, Chengdu briefly served as the capital of China. It is now one of the most important economic, financial, commercial, cultural, transportation, Chengdu Shuangliu International Airport is one of the 30 busiest airports in the world, and Chengdu Railway Station is one of the six biggest in China. Chengdu also hosts many international companies and more than 12 consulates, more than 260 Fortune 500 companies have established branches in Chengdu. In 2006, China Daily named it Chinas 4th-most-livable city, the name Chengdu is attested in sources going back to shortly after its founding. The present spelling is based on pinyin romanization, its Postal Map romanization was Chengtu and its former status as the seat of the Chengdu Prefecture prompted Marco Polos spellings Sindafu, Sin-din-fu, &c. and the Protestant missionaries romanization Ching-too Foo. Although the official name of the city has remained constant, the area has sometimes taken other names. The city logo adopted in 2011 is inspired by the Golden Sun Bird excavated from the Jinsha Ruins, archaeological discoveries at the Sanxingdui and Jinsha sites have established that the area surrounding Chengdu was inhabited over four thousand years ago. At the time of Chinas Xia, Shang, and Zhou dynasties, in the early 4th century BC, the ninth king of Shus Kaiming dynasty relocated from nearby Pi County, giving his new capital the name Chengdu. Shu was conquered by Qin in 316 BC and the settlement refounded by the Qin general Zhang Yi, under the Han, the brocade produced at Chengdu became fashionable and was exported throughout China. A Brocade Official was established to oversee its quality and supply, after the fall of the Eastern Han, Liu Bei ruled Shu, the southwestern of the Three Kingdoms, from Chengdu. His minister Zhuge Liang called the area the Land of Abundance, under the Tang, Chengdu was considered the second most prosperous city in China after Yangzhou. Both Li Bai and Du Fu lived in the city, Li Bai praised it as lying above the empyrean. The citys present Caotang was constructed in 1078 in honor of an earlier, more humble structure of that name erected by Du Fu in 760, the Taoist Qingyang Gong was built in the 9th century. Chengdu was the capital of Wang Jians Former Shu from 907 to 925, the Later Shu was founded by Meng Zhixiang in 934, with its capital at Chengdu
3.
Dujiangyan City
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It has an area of 1,208 km2 and a population of 600,000 in 2003. Dujiangyan was formerly a county named Guanxian, in Chinese literally irrigation county, around 250 BC during the Warring States period, Li Bing, a governor of Shu in the Qin state with his son directed the construction of Dujiangyan. Li Bing gave up the old way of dam building, which was trying to catch the floodwaters. Instead he employed a new method by channeling and dividing the water to harness the Min River and he accomplished this by separating the project into two main parts, the headwork and the irrigation system. The project effectively put flood waters under control and it has contributed greatly to the richness of Chengdu Plain with its reputation as The Land of Abundance. On 12 May 2008, the city was the closest to the epicenter of the 2008 Sichuan earthquake, xinjian Primary School, Juyuan Middle School, and Xiange Middle School collapsed in the earthquake, Beijie Primary School did not collapse. Ōtake, Hiroshima, Japan Dujiangyan Irrigation System Dujiangyan
4.
Chengdu Railway Station
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Chengdu Railway Station is one of the 3 major railway stations in Chengdu, China, the others being Chengdu South Railway Station and Chengdu East Railway Station. The station is located on North Second Ring Road, Jinniu District and it is governed by Chengdu Railway Bureau and is one of the most important hubs of the railway network in China. This railway station is called by locals as Huǒ Chē Běi Zhàn. However, confusingly there is officially named Chengdu North Railway Station,17 km north of this station. Chengdu Railway Station can be reached by taking Chengdu Metro Line 1, media related to Chengdu train station at Wikimedia Commons
5.
China Railway High-speed
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China Railway High-speed is the high-speed rail service operated by China Railway. Hexie Hao is the designation for rolling stock operated for this service, All trains had been marked CRH, before being changed shortly afterwards to the Chinese characters 和谐号 on the centre of the head vehicles and the side of the walls of other vehicles. The introduction of CRH was a part of the sixth national railway speedup. All high-speed trains in use in China are named CRH. CRH1/2A/2B/2E/5 are expected to have a speed of 250 km/h. The new trainsets CRH380A have a maximum test speed of 416.6 km/h, the fastest trainset, CRH380BL, attained a maximum test speed of 487.3 km/h 302.8 mph). High-speed rail services were first introduced in 2007 operating with CRH rolling stock and those run on existing lines that have been upgraded to speeds of up to 250 km/h and on newer dedicated high-speed track rated up to 350 km/h. China Railway High-speed runs different electric multiple unit trainsets, the designs for which are imported from other nations and designated CRH-1 through CRH-5 and CRH380A, CRH380B, CRH trainsets are intended to provide fast and convenient travel between cities. Some of the trainsets are manufactured locally through technology transfer, a key requirement for China, the signalling, track and support structures, control software, and station design are developed domestically with foreign elements as well, so the system as a whole is predominantly Chinese. China currently holds many new patents related to the components of these trains. However, these patents are valid within China, and as such hold no international power. An order for 60 8-car sets had been placed in 2004, with the first few built in Japan and it is designed to have two versions, one with a top operating speed of 220 km/h, the other with a top operating speed of 160 km/h. They will be used on 200 km/h or 250 km/h Inter-city High Speed Rail lines, planned to service by 2011 CRH380A. CRH3C and CRH2C designs have an MOR of 300 km/h, and can reach up to 350 km/h, however, in practical terms, issues such as maintenance costs, comfort, and safety make the maximum speed of more than 380 km/h impractical and remain limiting factors. Based on data published by Sinolink Securities, some changes were made according to the most recent news. ^1 All CRH380B and CRH380C units to be delivered before 2012, ^2 All CRH380D units to be delivered before 2014. Before the introduction of technology, China conducted independent attempts to domestically develop high-speed rail technology. Some notable results included the China Star, but domestic Chinese companies lacked the technology and expertise of foreign companies, if using only their own resources and expertise, the country might need a decade or longer to catch up with developed nations
6.
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
7.
Line 2, Chengdu Metro
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Line 2 of the Chengdu Metro is the second line on the metro network in Chengdu, Sichuan, China. Line 2 is a crosstown northwest-southeast trunk route and this line serves the Chengdu East Railway Station. Line 2 began operation on September 16,2012, the information in this article is mostly based on that in its Chinese equivalent
8.
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
9.
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
10.
High-speed rail in China
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High-speed rail in China is the longest HSR system in the world extending to 29 of the countrys 33 provincial-level entities. The network consists of newly built passenger-dedicated lines and intercity lines along with upgraded mixed passenger, the addition of PDLs and other high speed lines is ongoing with the network of PDLs alone set to reach 38,000 km in 2025. Chinas early high-speed trains were imported or built under technology transfer agreements with foreign train-makers including Alstom, Siemens, Bombardier, since the initial technological support, Chinese engineers have re-designed internal train components and built indigenous trains manufactured by the CRRC Corporation. The earliest example of higher-speed commercial train service in China was the Asia Express, the steam-powered train, which ran on the Southern Manchuria Railway from Dalian to Xinjing, had a top commercial speed of 110 km/h and a test speed of 130 km/h. It was faster than the fastest trains in Japan at the time, after the founding of the Peoples Republic of China in 1949, this train model was renamed the SL-7 and was used by the Chinese Minister of Railways. State planning for Chinas current high-speed railway network began in the early 1990s, in December 1990, the Ministry of Railways submitted to the National Peoples Congress a proposal to build a high-speed railway between Beijing and Shanghai. In December 1994, the State Council commissioned a feasibility study for the line, policy planners debated the necessity and economic viability of high-speed rail service. Supporters argued that rail would boost future economic growth. Opponents noted that high-speed rail in other countries were expensive and mostly unprofitable, overcrowding on existing rail lines, they said, could be solved by expanding capacity through higher speed and frequency of service. In 1993, commercial service in China averaged only 48 km/h and was steadily losing market share to airline. The line was electrified in 1998, and Swedish-made X2000 trains increased service speed to 200 km/h, after the completion of a third track in 2000 and a fourth in 2007, the line became the first in China to run high-speed passenger and freight service on separate tracks. The completion of the round of the Speed-Up Campaign in April 2007 brought HSR service to more existing lines,423 km capable of 250 km/h train service and 3,002 km capable of 200 km/h. In all, travel speed increased on 22,000 km, or one-fifth, of the rail network. The introduction of more service between large cities also helped to reduce travel time. The non-stop express train from Beijing to Fuzhou shortened travel time from 33.5 to less than 20 hours, in addition to track and scheduling improvements, the MOR also deployed faster CRH series trains. During the Sixth Railway Speed Up Campaign,52 CRH trainsets entered into operation, the new trains reduced travel time between Beijing and Shanghai by two hours to just under 10 hours. The development of the HSR network in China was initially delayed by a debate over the type of technology to be used. In 2004, the Shanghai Maglev Train became the worlds first commercially operated high-speed maglev and it remains the fastest commercial train in the world with peak speeds of 431 km/h and makes the 30.5 km trip in less than 7.5 minutes
11.
Sichuan
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In antiquity, Sichuan was the home of the ancient states of Ba and Shu. Their conquest by Qin strengthened it and paved the way for the First Emperors unification of China under the Qin Dynasty, during the Three Kingdoms era, Liu Beis Shu was based in Sichuan. The area was devastated in the 17th century by Zhang Xianzhongs rebellion and the areas subsequent Manchu conquest, during the Second World War, Chongqing served as the temporary capital of the Republic of China, making it the focus of Japanese bombing. It was one of the last mainland areas to fall to the Communists during the Chinese Civil War and was divided into four parts from 1949 to 1952, with Chongqing restored two years later. It suffered gravely during the Great Chinese Famine of 1959–61 but remained Chinas most populous province until Chongqing Municipality was again separated from it in 1997, the people of Sichuan speak a unique form of Mandarin, which took shape during the areas repopulation under the Ming. The family of dialects is now spoken by about 120 million people, in Modern Chinese, the name Sichuan has the meaning four rivers and this folk etymology is usually extended to list the provinces four major rivers, the Jialing, Jinsha, Min, and Tuo. In addition to its map and Wade-Giles forms, the name has also been irregularly romanized as Szű-chuan and Szechuan. In antiquity, the area of modern Sichuan was known to the Chinese as Ba and Shu, in reference to the ancient states of Ba and it was the refuge of the Tang court during the An Lushan Rebellion of the mid-8th century. The region had its own religious beliefs and worldview. The most important native states were those of Ba and Shu, Ba stretched into Sichuan from the Han Valley in Shaanxi and Hubei down the Jialing River as far as its confluence with the Yangtze at Chongqing. Shu occupied the valley of the Min, including Chengdu and other areas of western Sichuan, the existence of the early state of Shu was poorly recorded in the main historical records of China. It was, however, referred to in the Book of Documents as an ally of the Zhou and this site, believed to be an ancient city of Shu, was initially discovered by a local farmer in 1929 who found jade and stone artefacts. The Sichuan basin is surrounded by the Himalayas to the west, the Qin Mountains to the north, Qin armies finished their conquest of the kingdoms of Shu and Ba by 316 BC. Any written records and civil achievements of earlier kingdoms were destroyed, Qin administrators introduced improved agricultural technology. Li Bing, engineered the Dujiangyan irrigation system to control the Min River and this innovative hydraulic system was composed of movable weirs which could be adjusted for high or low water flow according to the season, to either provide irrigation or prevent floods. The increased agricultural output and taxes made the area a source of provisions, Sichuan was subjected to the autonomous control of kings named by the imperial family of Han Dynasty. Shu-Han claimed to be the successor to the Han Dynasty, in 263, the Jin dynasty of North China, conquered the Kingdom of Shu-Han as its first step on the path to unify China again, under their rule. Salt production becomes a business in Ziliujing District
12.
China
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China, officially the Peoples Republic of China, is a unitary sovereign state in East Asia and the worlds most populous country, with a population of over 1.381 billion. The state is governed by the Communist Party of China and its capital is Beijing, the countrys major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a power and a major regional power within Asia. Chinas landscape is vast and diverse, ranging from forest steppes, the Himalaya, Karakoram, Pamir and Tian Shan mountain ranges separate China from much of South and Central Asia. The Yangtze and Yellow Rivers, the third and sixth longest in the world, respectively, Chinas coastline along the Pacific Ocean is 14,500 kilometers long and is bounded by the Bohai, Yellow, East China and South China seas. China emerged as one of the worlds earliest civilizations in the basin of the Yellow River in the North China Plain. For millennia, Chinas political system was based on hereditary monarchies known as dynasties, in 1912, the Republic of China replaced the last dynasty and ruled the Chinese mainland until 1949, when it was defeated by the communist Peoples Liberation Army in the Chinese Civil War. The Communist Party established the Peoples Republic of China in Beijing on 1 October 1949, both the ROC and PRC continue to claim to be the legitimate government of all China, though the latter has more recognition in the world and controls more territory. China had the largest economy in the world for much of the last two years, during which it has seen cycles of prosperity and decline. Since the introduction of reforms in 1978, China has become one of the worlds fastest-growing major economies. As of 2016, it is the worlds second-largest economy by nominal GDP, China is also the worlds largest exporter and second-largest importer of goods. China is a nuclear weapons state and has the worlds largest standing army. The PRC is a member of the United Nations, as it replaced the ROC as a permanent member of the U. N. Security Council in 1971. China is also a member of numerous formal and informal multilateral organizations, including the WTO, APEC, BRICS, the Shanghai Cooperation Organization, the BCIM, the English name China is first attested in Richard Edens 1555 translation of the 1516 journal of the Portuguese explorer Duarte Barbosa. The demonym, that is, the name for the people, Portuguese China is thought to derive from Persian Chīn, and perhaps ultimately from Sanskrit Cīna. Cīna was first used in early Hindu scripture, including the Mahābhārata, there are, however, other suggestions for the derivation of China. The official name of the state is the Peoples Republic of China. The shorter form is China Zhōngguó, from zhōng and guó and it was then applied to the area around Luoyi during the Eastern Zhou and then to Chinas Central Plain before being used as an occasional synonym for the state under the Qing
13.
China Railways CRH1
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The total value of the order is €560 million. In July 2010, a further 40 CRH1A eight-car trains were ordered, most CRH1 trains were allocated to Guangshen Railway for replacing all locomotive-hauled trains between Guangzhou and Shenzhen in Guangdong province. Some are also used on the line Shanghai – Nanjing, CRH1A and CRH1B are based on Bombardiers Regina family. The train was designed by Sifang and Bombardier jointly in Västerås, Sweden, the first units （CRH1-001A） were delivered on August 30,2006, the CRH1A sets started service from February 1,2007 at the Guangzhou -Shenzhen Railway. The NG variant is a new model, which will use new materials in order to weight reductions. On October 31,2007, the Chinese MOR ordered 20 sets of CRH1B trains, each CRH1B consists of 16 cars, including 3 first class coaches,12 second class coaches and 1 dining car. On July 23,2011, CRH1-046B was hit on ZY104600 car by CRH2-139E in Yongtaiwen PFL accident. On October 31,2007, the Chinese MOR ordered 20 sets of CRH1E trains. The CRH1E is the first high-speed 16-car sleeper train in the world which is based on Bombardiers ZEFIRO250 km/h design, the train was designed by Bombardier and Zagato. The CRH380D is also derived from the Bombardier Zefiro family of high speed EMUs and are not direct derivatives of the Regina type trains from which the CRH1A. Top speed is advertised at 380 km/h, the 8-car version is designated CRH380D, series number CRH380D-1501 ～ CRH380D-1570
14.
Viaduct
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A viaduct is a bridge composed of several small spans for crossing a valley, dry or wetland, or forming a flyover. The term viaduct is derived from the Latin via for road and ducere, the ancient Romans did not use the term, it is a modern derivation from an analogy with aqueduct. Like the Roman aqueducts, many early viaducts comprised a series of arches of equal length. Viaducts may span land, water or both, a viaduct is a bridge composed of several small spans for crossing a valley or a gorge. The term is conventional for a flyover as opposed to a flying junction or a rail bridge which crosses one feature. In Romance languages, the word refers to a bridge which spans only land. A bridge spanning water is called ponte, the longest viaduct in antiquity may have been the Pont Serme which crossed wide marshes in southern France. Viaducts are commonly used in cities that are railroad centers, such as Chicago, Atlanta, Birmingham, London. These viaducts cross the railroad yards that are needed for freight trains there. These viaducts keep highway and city street traffic from having to be interrupted by the train traffic. Likewise, some viaducts carry railroads over large valleys, or they carry railroads over cities with many cross-streets, many viaducts over land connect points of similar height in a landscape, usually by bridging a river valley or other eroded opening in an otherwise flat area. Often such valleys had roads descending either side that become inadequate for the traffic load, such bridges also lend themselves for use by rail traffic, which requires straighter and flatter routes. Some viaducts have more than one deck, such that one deck has vehicular traffic, others were built to span settled areas, crossing over roads beneath—the reason for many viaducts in London. Viaducts over water use of islands or successive arches. The Millau Viaduct is a cable-stayed road-bridge that spans the valley of the River Tarn near Millau in southern France and it was formally dedicated on 14 December 2004 and opened to traffic two days later. The viaduct Danyang–Kunshan Grand Bridge in China is the longest bridge in the according to Guinness World Records as of 2011. Where a viaduct is built across land rather than water, the space below the arches may be used for such as car parking, vehicle repairs, light industry, bars. In the United Kingdom, many lines in urban areas have been constructed on viaducts
Media related to Chengdu–Dujiangyan Intercity Railway at Wikimedia Commons
Chengdu Metro
Intercity Rails
