Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q846907> ?p ?o }
- Q846907 subject Q6994524.
- Q846907 subject Q8632005.
- Q846907 abstract "Template:ForA spiral (sometimes called a spiral loop or just loop) is a technique employed by railways to ascend steep hills.A railway spiral rises on a steady curve until it has completed a loop, passing over itself as it gains height, allowing the railway to gain vertical elevation in a relatively short horizontal distance. It is an alternative to a zig-zag, and avoids the need for the trains to stop and reverse direction while ascending. If the train is of sufficient length, it is often possible to view the train looping above itself.A spiral loop should not be confused with the transition spiral or spiral easement used to provide a transition from a tangent into a horizontal circular curve. Spiral easement is used to avoid abrupt changes in the sideward acceleration experienced by a railway vehicle and the passengers in the vehicle approaching the horizontal circular curve and to prevent abrupt forces and discomfort. These curve layouts are also used in highway engineering.Spirals are not generally needed on tramways (street running or reserved track) or light rail lines because trams traditionally have all wheels powered, giving the ability to climb much steeper direct gradients than railways. In addition, the space consumed by a spiral is usually not available in an urban environment.A similar feature to railway spirals in road design is the pigtail bridge.".
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