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			 Metropolitan Transportation Authority officials are installing 
			four different "intrusion detection" systems at undisclosed 
			locations along the city's roughly 660 miles of subway tracks, said 
			MTA spokesman Kevin Ortiz. 
 			The four systems being tested are all designed to detect a person on 
			the tracks and alert approaching train conductors to hit the brakes, 
			Ortiz said.
 			The different systems employ a variety of technologies ranging from 
			thermal-imaging cameras and cameras equipped with "intelligent 
			video" software to webs of laser beams or radio frequencies.
 			For the city's 5.3 million weekday subway riders — many of whom 
			brave shoulder-to-shoulder crowds on packed platforms during rush 
			hours — the fear of falling or being pushed into the path of an 
			oncoming train is ever present. 			
			 
 			"I stand in the center of the platform until the train has pulled 
			in," said Christal Smith, 31, a Bronx nursing home supervisor. "Who 
			wants to die like that?"
 			The odds of being hit by a city subway train are slim. Last year, 
			141 commuters were hit by trains, with 52 resulting in fatalities, 
			Ortiz said. About one-third of those who are struck each year are 
			attempted suicides, he said. The city subway system has an annual 
			ridership of 1.7 billion, according to its website.
 			Still, the fear is pervasive. 			"This, along with the terrorism, is something that the riding public 
			worries about," said Gene Russianoff, chief spokesman for the 
			Straphangers Campaign, a rider advocacy group.
 			
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 			Brooklyn commuter Jesse James, 20, said he was riding in the front 
			car, next to the subway conductor's booth last year when he saw a 
			passenger fall onto the tracks at a 34th Street station.
 			"The conductor was honking and pulling on the brakes," James said, 
			as fellow riders helped pull the fallen passenger back onto the 
			platform — just in time.
 			If any of the four systems are approved for use, the installation 
			would be paid for out of the MTA's capital budget, as opposed to a 
			fare hike, Ortiz said.
 			The pilot program was first reported by the New York Daily News.
 			(Reporting By Chris Francescani; editing by Gunna Dickson) 
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