[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/flying-junction-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki24\/flying-junction-wikipedia\/","headline":"Flying junction – Wikipedia","name":"Flying junction – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Type of railway junction after-content-x4 Flying junction: with a bridge, trains do not","datePublished":"2022-04-23","dateModified":"2022-04-23","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/7\/72\/Flying-junction-both-tracks.svg\/220px-Flying-junction-both-tracks.svg.png","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/7\/72\/Flying-junction-both-tracks.svg\/220px-Flying-junction-both-tracks.svg.png","height":"347","width":"220"},"url":"https:\/\/wiki.edu.vn\/en\/wiki24\/flying-junction-wikipedia\/","wordCount":2199,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Type of railway junction         (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Flying junction: with a bridge, trains do not block each otherA flying junction or flyover is a railway junction at which one or more diverging or converging tracks in a multiple-track route cross other tracks on the route by bridge to avoid conflict with other train movements. A more technical term is “grade-separated junction”. A burrowing junction or dive-under occurs where the diverging line passes below the main line.The alternative to grade separation is a level junction or flat junction, where tracks cross at grade, and conflicting routes must be protected by interlocked signals.Table of Contents       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Complexity[edit]Flying junction without crossings[edit]High-speed rail[edit]Examples[edit]See also[edit]References[edit]External links[edit]Complexity[edit]  Fretin triangle in France: Each side is over 3\u00a0km (2\u00a0mi) long. A grade-separated wye. TGV and Eurostar trains cross the junction at 300\u00a0km\/h (186\u00a0mph).Simple flying junctions may have a single track pass over or under other tracks to avoid conflict, while complex flying junctions may have an elaborate infrastructure to allow multiple routings without trains coming into conflict, in the manner of a highway stack interchange.Flying junction without crossings[edit]Where two lines each of two tracks merge with a flying junction, they can become a four-track railway together, the tracks paired by direction. This happens regularly in the Netherlands (see Examples below).High-speed rail[edit]Nearly all junctions with high-speed railways are grade-separated. On the French Lignes \u00e0 Grande Vitesse (TGV) high-speed network, the principal junction on the LGV Sud-Est, at Pasilly where the line to Dijon diverges, and on the LGV Atlantique at Courtalain where the line to Le Mans diverges, are fully grade-separated with special high-speed switches (points in British terminology) that permit the normal line speed of 300\u00a0km\/h (186\u00a0mph) on the main line, and a diverging speed of 220\u00a0km\/h (137\u00a0mph).[note 1]The LGV network has four grade-separated high-speed triangles: Fretin (near Lille), Coubert (southeast Paris), Claye-Souilly (northeast Paris) and Angles (Avignon).  A fifth, V\u00e9mars (northeast Paris), is grade-separated except for a single-track link on the least-used side, linking Paris Gare du Nord and Paris CDG airport.Examples[edit]AustraliaCanada  DenmarkFinlandRailway junction of two main lines at Kyt\u00f6maa, KeravaFrance (LGV Triangles)Triangle de Fretin, Lille, connecting Paris, Brussels and LondonTriangle de Coubert, ParisTriangle des Angles, Avignon, with two parallel 1.5-kilometre (0.93\u00a0mi) viaductsTriangle de Claye-Souilly, Paris, partial four-way junctionTriangle de V\u00e9mars, ParisGermanyHong KongNetherlands  There are between 25 and about 40 flying junctions on Dutch railways, depending on how more complex examples are counted.Flying junctions where the merged lines become a four track railway:More complex flying junctions, with tracks from four directions joining:NorwaySwedenTaiwanUnited Kingdom Pelaw Junction where both the Tyne and Wear Metro green line to  South Hylton joins the Durham Coast Line and yellow line continues to  South Shields \u2013 both diverging on the bridge itselfSpringhead Junction on the North Kent LineSouthfleet Junction on the HS1Norton Bridge Junction near Stone, StaffordshireHamilton Square underground station, Birkenhead, on MerseyrailAynho Junction in Aynho, NorthamptonshireWorting Junction near Basingstoke, Hampshire (the flyover is called Battledown Flyover)Cogload Junction near TauntonWeaver Junction near Dutton, CheshireShortlands Junction in south LondonNorthwest of Harrow-on-the-Hill, in the north London suburbsHitchin flyover, Hertfordshire.Werrington Junction dive-under, under construction north of Peterborough (north of Hitchin)Reading West JunctionBleach Green Viaducts & Junction, Whiteabbey, Northern IrelandUnited States      Northeast U.S. (Amtrak)Boston, Massachusetts areaChicago, IllinoisOn the Chicago “L”, where Orange Line trains diverge from Green Line trains north of 18th Street, as well as underground where a non-revenue flying junction separates Red Line trains heading to 95th from those heading to the South Side main line, currently used to send some rush-period Red Line trains to Ashland\/63rd.The Milwaukee\u2013Dearborn subway (now part of the Blue Line) was constructed to have a flying junction where turning between Lake Street and Milwaukee Avenue at Canal Street. The outbound tunnel and its stub, designed to continue west under Lake Street, was bored at less depth than the inbound tunnel and its Lake Street stub, in order to allow future Lake Street trains (now part of the Green and (Pink Lines) to run under or over the opposing Milwaukee Avenue trains while entering or exiting the shared portion of the Lake Street tunnels. Plans in 1939 called for tunnels to replace the elevated Lake Street tracks east of approximately Racine Avenue.[1][2] By 1962, the planned Lake Street tunnels to\/from Racine Avenue would have curved south to Randolph Street and bypassed the Milwaukee-Lake-Dearborn tunnel entirely.[3]Another flying junction is under construction immediately north of Belmont\/Sheffield to increase capacity on the Red Line, Brown Line, and Purple Line Express.Denver, ColoradoOn the Regional Transportation District in Denver between the Southeast Corridor and the I-225 Corridor: the Southeast Corridor is on the west side of I-25 and the I-225 Corridor is in the median of I-225. The grade separations of the junction are woven into the grade separations of the interchange between the two highways.New York, New YorkPhiladelphia, PennsylvaniaSan Francisco Bay Area, CaliforniaWashington, District of ColumbiaAll main-line connections on the Washington Metro \u2013 adjacent to the Pepco power plant on Benning Road (near the Stadium-Armory station) is a large three-track structure with a turnback pocket where the Blue, Silver and Orange Lines meet.  This would have been part of the Oklahoma Avenue station, had it been built.  South of the King Street station in Alexandria is a series of tunnels where the Blue and Yellow Lines meet.  There are also flying junctions near three underground rail stations:  Rosslyn (Blue, Silver, and Orange Lines), L’Enfant Plaza (Green and Yellow lines), and the Pentagon (Blue and Yellow lines).See also[edit]References[edit]^ City of Chicago, Department of Subways and Traction, Second Annual Report of the Department of Subways and Traction, City of Chicago, for the Year Ending December 31, 1940 (Chicago: City of Chicago, December 31, 1940).^ Chicago Department of Subways and Traction, Comprehensive Plan, 2-29, III-VII.^ Chicago Transit Board, Plan for Expanding Rapid Transit Service in the Central Area of Chicago (Chicago: Chicago Transit Board, April 20, 1962).External links[edit]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4"},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/flying-junction-wikipedia\/#breadcrumbitem","name":"Flying junction – Wikipedia"}}]}]