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Track gauge
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==Temporary way – permanent way== {{main|Permanent way}} [[File:East Side Access GCT cavern with work train.jpg|thumb|Narrow gauge work train in the [[East Side Access]] cavern where the Manhattan terminus of the standard gauge [[Long Island Rail Road]] was built.]] A '''temporary way''' is the temporary track often used for construction, to be replaced by the [[permanent way]] (the structure consisting of the rails, fasteners, [[Railroad tie|sleepers/ties]] and [[Track ballast|ballast]] (or slab track), plus the underlying subgrade) when construction nears completion. In many cases narrow-gauge track is used for a temporary way because of the convenience in laying it and changing its location over unimproved ground. In restricted spaces such as tunnels, the temporary way might be double track even though the tunnel will ultimately be single track. The [[Airport Link Company|Airport Rail Link]] in Sydney had construction trains of {{Track gauge|900mm|lk=on}} gauge, which were replaced by permanent tracks of {{Track gauge|1435mm}} gauge. During World War I, trench warfare led to a relatively static disposition of infantry, requiring considerable logistics to bring them support staff and supplies (food, ammunition, earthworks materials, etc.). Dense light railway networks using temporary narrow gauge track sections were established by both sides for this purpose.<ref name = wolmar>Christian Wolmar, ''Engines of War: How Wars Were Won & Lost on the Railways'', Atlantic Books, London, 2010, {{ISBN|978-1848871724}}</ref> In 1939 it was proposed to construct the western section of the [[Yunnan–Burma Railway]] using a gauge of {{Track gauge|15.25in|lk=on}}, since such tiny or "toy" gauge facilitates the [[Minimum railway curve radius|tightest of curves]] in difficult terrain.<ref>{{cite news |url=http://nla.gov.au/nla.news-article49460166 |title=TOY RAILWAY. |newspaper=[[The Northern Standard]] |location=Darwin, NT |date=8 December 1939 |access-date=5 December 2011 |page=15 |publisher=National Library of Australia}}</ref>
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