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Guadarrama Tunnel
The Guadarrama Tunnel is a railway tunnel across the Sierra de Guadarrama, forming a key portion of the Madrid–León high-speed rail line in Spain. It is the largest tunnel in Spain, as well as being the fifth largest in the world at the time of its completion. The tunnel comprises two individual parallel tubes, with regular interconnecting galleries throughout their length. The western tube is 28,407 m long and the eastern tube 28,418 m long, and it is the longest tunnel in Spain (when not counting the Line 12 tunnel in the Madrid Metro). The tunnel was opened for traffic in December 2007, and has been primarily used by the AVE high speed passenger trains. Construction The Guadarrama Tunnel was designed as the most substantial civil engineering work of the wider Madrid–León high-speed rail line, facilitating the movement of trains between the capital and the major cites of the north and north-western portions of Spain at speeds of up to . The route selected for the tunnel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madrid–León High-speed Rail Line
The Madrid–León high-speed rail line (Spanish language: ''Línea de Alta Velocidad Madrid - León'') was inaugurated on 29 September 2015. The line is built to standard gauge and gauge changers are provided at strategic points to allow interchange with older Spanish railways which were built to Iberian gauge. History The line was inaugurated in two stages. Its first 179.6 km section Madrid - Segovia - Valladolid opened for commercial service on 23 December 2007 and is the first instalment of a high-speed rail corridor in the north and northwest of Spain. AVE services reduced journey times between Madrid and Valladolid from 2½ hours to 56 minutes at an average speed of . The second 162.7 km section Valladolid-Venta de Baños- León opened on 29 September 2015 and was built at a cost of €1,62bn for operation at up to 350 km/h. Since then the journey time between Madrid and León was cut by 44 min to 2 h 6 min on AVE trains. Plan for 2015-2020 According to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Igneous
Igneous rock (derived from the Latin word ''ignis'' meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks. Igneous rock may form with crystallization to form granular, crystalline rocks, or without crystallization to form natural glasses. Igneous rocks occur in a wide range of geological settings: shields, platforms, orogens, basins, large igneous provinces, extended crust and oceanic crust. Geological significance Igneous and metamorphic rocks make up 90–95% of the top ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railway Tunnels In Spain
Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in tracks. In contrast to road transport, where the vehicles run on a prepared flat surface, rail vehicles (rolling stock) are directionally guided by the tracks on which they run. Tracks usually consist of steel rails, installed on sleepers (ties) set in ballast, on which the rolling stock, usually fitted with metal wheels, moves. Other variations are also possible, such as "slab track", in which the rails are fastened to a concrete foundation resting on a prepared subsurface. Rolling stock in a rail transport system generally encounters lower frictional resistance than rubber-tyred road vehicles, so passenger and freight cars (carriages and wagons) can be coupled into longer trains. The operation is carried out by a railway company, providing transport between train stations or freight customer faciliti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ballastless Track
A ballastless track or slab track is a type of railway track infrastructure in which the traditional elastic combination of ties/sleepers and ballast is replaced by a rigid construction of concrete or asphalt. Characteristics In ballastless tracks, the rails are rigidly fastened to special types of concrete ties/sleepers that are themselves set in concrete. Ballastless tracks therefore offer a high consistency in track geometry, the adjusting of which is not possible after the concreting of the superstructure. Therefore, ballastless tracks must be concreted within a tolerance of . The elasticity of the ballast in the traditional railway superstructure is replaced by flexibility between either the rails and the concrete ties/sleepers or the ties/sleepers and the concrete or asphalt slab as well inherent elasticity within the conglomerate of the tie/sleeper, whereas the concrete or asphalt slab is usually inelastic. Advantages The advantages of a ballastless track over a tradi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magdalena Alvarez
Magdalena may refer to: * Magdalena (given name), a given name derived from Mary Magdalene (including a list of people with the name) Entertainment * Magdalena (comics), an American comic book superheroine * ''Magdalena'' (film), a 1920 Czechoslovak film * ''Magdalena'' (Philippine TV series), a 2012 Philippine drama series * ''Magdalena'' (Mexican TV series), Mexican telenovela * ''Magdalena'' (novel), a Czech novel by Josef Svatopluk Machar Music * '' Magdalena: a Musical Adventure'', a 1948 folk operetta by Heitor Villa-Lobos * ''Magdalena'', a 1983 album by Freddie Aguilar, or the title song * "Magdalena", a song by Brandon Flowers from '' Flamingo'', 2010 * "Magdalena", a song by David Gray from ''Sell, Sell, Sell'', 1996 * "Magdalena", a song by dEUS from ''The Ideal Crash'', 1999 * "Magdalena", a song by Donny Hathaway from ''Extension of a Man'', 1973 * "Magdalena", a song by the Mothers of Invention from ''Just Another Band from L.A.'', 1972 * "Magdalena", a song by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunnel Boring Machine
A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They may also be used for microtunneling. They can be designed to bore through hard rock, wet or dry soil, or sand. Tunnel diameters can range from (micro-TBMs) to to date. Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal directional drilling rather than TBMs. TBMs can be designed to excavate non-circular tunnels, including u-shaped, horseshoe, square or rectangular tunnels. Tunnel boring machines are used as an alternative to drilling and blasting (D&B) methods in rock and conventional "hand mining" in soil. TBMs have the advantages of limiting the disturbance to the surrounding ground and producing a smooth tunnel wall. This significantly reduces the cost of lining the tunnel, and makes them suitable to use in urban areas. The major disadvan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granite
Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous intrusions. These range in size from dikes only a few centimeters across to batholiths exposed over hundreds of square kilometers. Granite is typical of a larger family of ''granitic rocks'', or ''granitoids'', that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase (the QAPF classification), with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few (known as leucogranites) contain almost no dark minerals. Granite is nearly alway ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gneiss
Gneiss ( ) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss forms at higher temperatures and pressures than schist. Gneiss nearly always shows a banded texture characterized by alternating darker and lighter colored bands and without a distinct cleavage. Gneisses are common in the ancient crust of continental shields. Some of the oldest rocks on Earth are gneisses, such as the Acasta Gneiss. Description Orthogneiss from the Czech Republic In traditional English and North American usage, a gneiss is a coarse-grained metamorphic rock showing compositional banding (gneissic banding) but poorly developed schistosity and indistinct cleavage. In other words, it is a metamorphic rock composed of mineral grains easily seen with the unaided eye, which form obvious compositional layers, but which has only a weak tendency to fracture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metamorphic
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, causing profound physical or chemical changes. During this process, the rock remains mostly in the solid state, but gradually recrystallizes to a new texture or mineral composition. The protolith may be an igneous, sedimentary, or existing metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. They are classified by their protolith, their chemical and mineral makeup, and their texture. They may be formed simply by being deeply buried beneath the Earth's surface, where they are subject to high temperatures and the great pressure of the rock layers above. They can also form from tectonic processes such as continental collisions, which cause horizontal pressure, friction, and distorti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Segovia
Segovia ( , , ) is a city in the autonomous community of Castile and León, Spain. It is the capital and most populated municipality of the Province of Segovia. Segovia is in the Inner Plateau (''Meseta central''), near the northern slopes of the Sistema Central range and on a bend of the Eresma river. The city is famous for its historic buildings including three main landmarks: its midtown Roman aqueduct, its cathedral (one of the last ones to be built in Europe following a Gothic style), and the medieval castle, which served as one of the templates for Walt Disney's Cinderella Castle. The city center was declared of World Heritage by UNESCO in 1985. Etymology The name of Segovia is of Celtiberian origin. Although historians have linked its old name to ', the recent discovery of the original Roman city in the nearby village of Saelices discarded this possibility. The name of "Segovia" is mentioned by Livy in the context of the Sertorian War. Under the Romans and Moors, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miraflores De La Sierra
Miraflores de la Sierra is a town and municipality in the northern area of the autonomous Community of Madrid, in central Spain, of c. 6,000 inhabitants, located 49 kilometers away from Madrid. History Miraflores de la Sierra, formerly known as Porquerizas was established by Segovian farmers in the thirteenth century. According to legend the town was renamed in 1627 by Elisabeth of Bourbon, wife of Philip IV of Spain Philip IV ( es, Felipe, pt, Filipe; 8 April 160517 September 1665), also called the Planet King (Spanish: ''Rey Planeta''), was King of Spain from 1621 to his death and (as Philip III) King of Portugal from 1621 to 1640. Philip is remembered .... Walking to the monastery of Santa María de El Paular she saw the village of Porquerizas surrounded by blooming flowers, at which point she exclaimed ''Mira, ¡flores!'' ("look, flowers!"). Festivities Beginning on 15 August Miraflores de la Sierra celebrates its festivities in honour of the ''Virgen de la Asunción. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
