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Topic: Overhead lines

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	Reference.com/Encyclopedia/Overhead lines
		Overhead lines or overhead wires are used to transmit electrical energy to trams, trolleybuses or trains at a distance from the energy supply point.
		Diesel trains may pass along these tracks without affecting the overhead line, although overhead clearance may be an issue.
		On overhead wires designed for trolley poles this is done by having a neutral section between the wires, but this requires an insulator.
	www.reference.com /browse/wiki/Overhead_lines (1802 words)

	Electric power transmission - Facts, Information, and Encyclopedia Reference article
		Redundant paths and lines are provided so that power can be routed from any power plant to any load center, through a variety of routes, based on the economics of the transmission path and the cost of power.
		Initially transmission lines were supported by porcelain pin-and-sleeve insulators similar to those used for telegraph and telephone lines.
		Also, at high AC voltages significant amounts of energy are lost due to corona discharge, the capacitance between phases or, in the case of buried cables, between phases and the soil or water in which the cable is buried.
	www.startsurfing.com /encyclopedia/e/l/e/Electric_power_transmission.html (2439 words)

	Light rail - Wikipedia, the free encyclopedia
		At the highest degree of separation, it can be difficult to draw the line between light rail and metros, as in the case of Wuppertal's Schwebebahn hanging rail system or London's Docklands Light Railway, which would likely not be considered "light" were it not for the contrast between it and the London Underground.
		When lines were built over longer distances (typically with a single track) before good roads were common, they were generally called interurban streetcars in North America or radial railways in Ontario.
		A notable exception is the New Jersey Transit River LINE from Camden to Trenton, which has received an exemption on the provision that light rail operations occur only during daytime hours and Conrail freight service only at night, with several hours separating one operation from the other.
	en.wikipedia.org /wiki/Light_rail (3787 words)

	Mass Rapid Transit (Singapore) - tScholars.com (Site not responding. Last check: 2007-10-23)
		The rail lines have been constructed by the Land Transport Authority, a department of the government of Singapore, which allocates operating concessions to the profit-based corporations SMRT Corporation and SBS Transit.
		The routes and stations for the future lines are speculative and actual stations and routes are subjected to study by the National University of Singapore.
		The 3.8-kilometre, two-station line will extend from Boon Lay MRT Station on the western end of the East West MRT Line, with one station along Jurong West Street 63 between Jurong West Street 61 and Pioneer Road North, and the second station at Joo Koon Circle, near the junction of Benoi Road and International Road.
	www.tscholars.com /encyclopedia/Mass_Rapid_Transit_(Singapore) (4827 words)

	PowerLineWork.com - History of Lineman (Site not responding. Last check: 2007-10-23)
		Telegraph lines could be strung on trees, but wooden poles were quickly adopted as the method of choice.
		As the public became more dependent on electricity, it became imperative that damaged power lines be repaired quickly.
		Also during the 1950s, some electric lines began to be installed in underground tunnels, expanding the scope of the work.
	www.powerlinework.com /lineman_history_ (906 words)

	Overhead lines - Education - Information - Educational Resources - Encyclopedia - Music
		On overhead wires designed for trolleypoles this is done by having a neutral section between the wire, but this requries an insulator.
		The driver of the tramcar turn off the power when the trolleypole passes through to prevent arching from burning-out the insulator.
		The use of overhead cables conducting electricity, invented by Granville T. Woods in 1888, amongst several other improvements by Woods, led to the development of electrified railways, the first of which was operated at Coney Island from 1892.
	education.music.us /O/Overhead-lines.htm (1537 words)

	Environmental Services -- EDM International, Inc.
		EDM is presently testing a Bird Strike Indicator to remotely detect and report collisions with overhead lines or guy wires.
		Other current research projects include developing a repellent for pileated woodpeckers, commercializing a spray on insulation to mitigate animal contacts with power lines, developing a repellent to deter squirrels from chewing aluminum conductor, and testing the feasibility of a remote bird and bat collision sensor for wind turbines.
		Power line locations, site specific biological data, Digital Elevation Models (DEMs), and other surface features are consolidated using GIS to identify bird use areas and conduct survey stratification for development of Avian Protection Plans.
	www.edmlink.com /environment.htm (877 words)

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