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Topic: Rail tracks

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	[No title] (Site not responding. Last check: 2007-11-06)
		Rail tracks are normally laid on a bed of coarse stone chippings known as ballast, which combines resilience, some amount of flexibility, and good drainage; however, track can also be laid on or into concrete (across bridges, for example).
		Small gaps are deliberately left between the rails, which are known as "expansion joints" to allow for expansion of the rails in hot weather, the holes through which the fishplate bolts pass are oval to allow for expansion.
		Joints are used in continuously welded rail when necessary, though; instead of a joint that passes straight across the rail, producing a loud noise and shock when the wheels pass over it, two sections of rail are cut at a steep angle and put together with a gap between them.
	wikiwhat.com /encyclopedia/r/ra/rail_tracks.html (923 words)

	Rail transport - Wikipedia, the free encyclopedia
		A typical railway (or railroad) track consists of two parallel steel (or in older networks, iron) rails, generally anchored perpendicular to beams (termed sleepers (Commonwealth except Canada) or railroad ties (U.S. and Canada) of timber, concrete, or steel to maintain a consistent distance apart, or gauge.
		The rails and perpendicular beams are usually then placed on a foundation made of concrete or compressed earth and gravel in a bed of ballast to prevent the track from buckling (bending out of its original configuration) as the ground settles over time beneath and under the weight of the vehicles passing above.
		Rail lines that carry little traffic are often built with a single track used by trains in both directions; on rail lines like these, "crossovers", "passing loops" or "passing sidings", which consist of short stretches of double track, are provided along the line to allow trains to pass each other, and travel in opposite directions.
	en.wikipedia.org /wiki/Rail_transport (2786 words)

	Reference.com/Encyclopedia/Rail tracks
		Railways rails are made in a large number of different sizes (weights), and the choice of size is a balance of economic and technical factors.
		In this form of track, lengths of rail, usually around 20 metres (60 feet) long are laid and fixed to sleepers (UK) (crossties, or simply ties in US practice), and are joined to other lengths of rail with steel plates known as fishplates (UK) or joint bars (US).
		Most railroad track in the United States is still of this type, however, and laid on timber ties; the lower speeds of American railroads make the disadvantages less apparent and the abundant supply of timber in the US makes its use for railroad ties much cheaper than in Europe.
	www.reference.com /browse/wiki/Rail_tracks (1594 words)

	Rail transport - InfoSearchPoint.com (Site not responding. Last check: 2007-11-06)
		It consists of two parallel rails, usually made of steel, and wooden or concrete sleepers or ties that hold the rails exactly at the proper distance from each other.
		Rail transport is one of the most energy efficient means of mechanised land transport known.
		Rail transport is also one of the safest modes of transport, and also makes a highly efficient use of space: a double tracked rail line can carry more passengers or freight in a given amount of time, than a four-laned road.
	www.infosearchpoint.com /display/Rail_transport (1075 words)

	☞ freight - side tracks for rail yards freight - side tracks for rail yards freight online guide
		Railroad Station is on the south side of the rail yard.
		Between Thirtieth and Sixtieth Street Yards, the tracks are to be...
		tracks at Wertland and 15th on the way to an evening out and survey the scene as though it's some sinister rail-side...
	www.all-freight.info /freight/side-tracks-for-rail-yards-freight.html (925 words)

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