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Spiral (railway)

A spiral is a technique employed by railways to ascend steep hills.

List of spirals
Argentina • Two spirals between Tacuara and Meseta at and on the heritage Tren a las Nubes section of the Salta–Antofagasta railway part of the General Manuel Belgrano Railway. Australia • Spiral on the uphill track at Bethungra on the Main Southern railway line in New South Wales. The downhill track remains on the original steep plain 1 in 40 gradient. • Spiral on the single track at Cougal on the North Coast railway line, New South Wales. Bulgaria • Four Spirals on the Rhodope Mountain Line between Septemvri to Dobrinishte railway between Velingrad and Cherna Mesta at , , and . • Spiral just outside Klisura at on the Sofia to Tulovo railway. • Spiral just outside Radevtsi at on the Ruse to Dimitrovgrad railway. • There used to be a spiral at at Trinity, Newfoundland on the former Newfoundland Railway. • There used to be a spiral at Rogers Pass at that was superseded when the Connaught Tunnel (British Columbia) was built. China at night. The route containing the spiral was replaced by a 32-km long tunnel (at the time of completion the longest in China) in 2014. • There used to be a spiral at Guanjiao at on the Qinghai–Tibet Railway; it was replaced by a tunnel in 2014. (see photo). • Spiral between Qingshiya and Guanyinshan at on the Baoji–Chengdu Railway. • Six spirals on the Chengdu–Kunming Railway at: • South of Baishiyan at . • Lewu at . • Wazu at . • Tiekou at . • Ananzhuang at . • Longgudian at . • Spiral at Shangshali at on the Harbin–Manzhouli Railway. • Three spirals on the Liupanshui–Hongguo Railway at: • Maocaoping at . • Duchuanzhai at . • Sanjiazhai at . • There are four spirals on the Southern Xinjiang Railway at , , and on a by-passed section between Yu'ergou and Hejing that is now freight only. This line was rebuilt on a shorter route in 2014. Costa Rica Replica of the Brusio Spiral Viaduct at on the Tren Turistico Arenal, 10 km east of Nuevo Arenal, Guanacaste. Croatia • Spiral between Rijeka-Brajdica and Sušak-Pećine at on the RijekaKarlovac railway, part of International corridor V. The spiral is mainly in a tunnel. Eritrea • Spiral between Asmara and Arbaroba at on Eritrean Railways. This spiral pushes the definition of a spiral as the line crosses itself but then immediately crosses back, and it does this in a tunnel. France • Three spirals on the Col de Tende line between Ventimiglia to Cuneo as it passes through France, a further spiral on this line is in Italy. • Just north of Fontan at . • Saint Dalmas-de-Tende at . • Tende at . • Spiral at Moûtiers at between Albertville and Bourg-Saint-Maurice used by TGV. • Spiral partly in a tunnel at Claveisolles at on the Paray-le-Monial to Lozanne line (between Saint-Nizier-d'Azergues and Poule-les-Écharmeaux). • Spiral north of L'Hospitalet près l'Andorre at on the line between Latour-de-Carol and Ax-les-Thermes. • There used to be a spiral in the Sayerce tunnel at on the former Pau–Canfranc railway line between Pau and Zaragoza (Spain) in the Pyrenees. This spiral is now a footpath. • Spiral on the Wutach Valley Railway at . The line was built partly for strategic reasons and had to be built to a reasonable gradient in order to haul heavy military trains over it. The alternative, shorter SingenWaldshut route was not available for this traffic, since it crossed Swiss territory. The line is now a heritage railway. India • There are currently three spirals on the Darjeeling Himalayan Railway: • Chunbati Loop at . • Agony Point at . • There used to be a spiral at Dhulghat at between Khandwa and Hingoli on the metre gauge railway, the spiral was apparently removed when the track was upgraded to broad gauge. Iran • Spirals near Dowgal station at and extensive horseshoe curves in the Alborz Mountains on the Trans-Iranian Railway. Ireland • The St. James's Gate Brewery, Dublin, Ireland formerly had an internal gauge railway with a loop in a tunnel to gain height between buildings. Italy • Spiral at Bortigiadas on the Sassari-Palau railway on Sardinia. • Spiral near Lanusei on the MandasGairoArbatax railway on Sardinia. • Spiral near Vernante on the Col de Tende railway from Ventimiglia to Cuneo. There are a further three spirals on this line in French territory. • Spiral at Casole Bruzio on the Cosenza to San Giovanni in Fiore line (line exists but is not in service). Japan in Hisatsu Line, Japan in Tokyo, Japan. • Spiral South of Echigo-Nakazato at on the Tokyo bound Jōetsu Line. • Spiral at Shimizu Tunnel at on the Tokyo-bound Jōetsu Line. • Spiral South of Mazeras at near Mombasa. • Spiral near Makutano station at : . • Spiral near Equator station at . Madagascar • Spiral at Anjiro at on the main line from Antananarivo to Toamasina. Mexico • Spiral between Creel and San Rafael at on the Ferrocarril Chihuahua al Pacífico. Myanmar  – Taunggyi line, Myanmar • One spiral on the Burma Mines Railway at . • One spiral close to Shwenyaung at on the Thazi-Taunggyi line. New ZealandRaurimu Spiral at on the North Island Main Trunk. The line is single track and involves two short tunnels around a suitable hill. • There used to be a spiral at on the Ellis and Burnand Tramway, Ongarue, which closed in 1958 and is now part of the Timber Trail. Norway • Spiral on the Flåm Line between Myrdal and Flåm at . • Spiral on the Vestfold Line around the town of Tønsberg at . Peru • Spiral between San Bartolome and Matucana at on the Central Railway. Russia • Spiral just north of Indyuk at on the North Caucasus Railway route from Tuapse (Tуапсе) through Gornyy to Belorechensk (Белореченск). • There used to be a spiral at "Devil's Bridge", on the now abandoned line from Kholmsk to Yushno-Sakhalinsk on Sakhalin Island. Serbia • Spiral at Jatare at on the Šargan Eight Heritage Railway in Western Serbia between from Mokra Gora and Šargan Vitasi. • Spiral at Van Reenen's Pass at on the line from Harrismith to Ladysmith. South Korea , South Korea • Spiral at Hambaek 1st Tunnel at between Hambaek station and Jodong station on the Hambaek Line;– one loop, single track. • There used to be a spiral at Daegang Tunnel at between Danseong station and Jungnyeong station on the Jungang Line;– one loop, single track. A new double track tunnel has opened which by-passes the line with the spiral, which has since closed. • There used to be a spiral at Ddwari Tunnel at between Geumgyo station and Chiak station on Jungang Line. A new double track tunnel has opened which by-passes the line with the spiral, which has since closed. Spain • Spiral near Toses at on the Ripoll to Latour-de-Carol, France line. • Spiral at La Granja de San Vicente at on the Palencia to A Coruña line. Sri Lanka • Spiral at Demodara railway station at on the line from Bandarawela to Badulla. Demodara railway station is located above the spiral tunnel. Switzerland Albulabahn • The Gotthard railway has spirals and horseshoe curves or bends mostly in tunnels on its standard gauge, double track line. The spirals are: • North of Wassen at Pfaffensprung on the Northern approach at , this loop is followed by two horseshoe bends around Wassen. • Piottino spirals on the Southern approach at and at . • South of Bergün at . • Spiral East of Grengiols at on the former Furka Oberalp Bahn, now Matterhorn Gotthard Bahn, between Grengiols and Lax. Track length is 5 kilometers, while the endpoints of the spiral are only 570 meters apart horizontally and 233 meters vertically. Uganda • There used to be a spiral at Circle Hill on the Western Uganda Extension of the Kenya to Uganda Railway Line to Kasese. United Kingdom on the Ffestiniog Railway, Wales. • Spiral around Dduallt railway station at on the Ffestiniog Railway in Wales. • The line at from Moorswater cement terminal, through Coombe Junction and Liskeard on the Looe Valley Line and on over Moorswater Viaduct forms a complete spiral, climbing up to join the main line at Liskeard. Not all parts are used by passenger trains. • Williams Loop, east of East Quincy, California at on the former Western Pacific Railroad now part of Union Pacific Railroad. • Hiwassee Loop, also known as the Hook and Eye; 2 miles NNE of Farner, Tennessee at on the former Atlanta, Knoxville and Northern Railway now operated as a heritage railroad by the Tennessee Valley Railroad Museum, which operates excursion trains from Etowah, Tennessee to Copperhill, Tennessee via the loop, as well as trains just to the loop and back from Etowah. • Georgetown Loop, at Georgetown, Colorado at on the former Colorado Central Railroad. The spiral was completed in 1884, abandoned and dismantled in 1939, rebuilt between 1972 and 1984 and is now owned by History Colorado and operated as the Georgetown Loop Railroad. • The MAX Red Line, a light rail line in Portland, Oregon, loops over itself at in the vicinity of the Gateway Transit Center. • In the Loop District of the Alaska Railroad at between mileposts 48 and 51 northeast of Seward, Alaska, there was a spiral and a horseshoe curve both on an extensive range of timber trestles up to 106 feet high. Track relocation in 1951 removed all of this but added a new horseshoe at milepost 48. • Abandoned spiral at Riflesight Notch Loop at Rollinsville, Colorado at on the former Denver and Salt Lake Railway route over Rollins Pass. The spiral was bypassed by the Moffat Tunnel built in 1928, and was dismantled in 1935. • Abandoned spiral called Double Circle, or Double Loop, or The Golden Circle, at east of Eureka, Utah on the former Tintic branch of the Denver and Rio Grande Western Railroad. It was bypassed in 1940 and the branch removed in 1943. • Abandoned spiral on the Roaring Camp and Big Trees Railroad at . The spiral was completed in 1963. The spiral was bypassed by two switchbacks after a trestle fire in 1976. ==See also==
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