FILE - In this Jan. 25, 2010 file photo, cars from AeroTrain 

FILE - In this Jan. 25, 2010 file photo, cars from AeroTrain pass behind glass security barriers at Washington Dulles International Airport in Washington. New York City transit officials are considering similar safety barriers between passenger platforms and trains after two people were pushed and a third fell to their deaths on the tracks since early December 2012. (AP Photo/Jose Luis Magana, File)
Associated Press
FILE - In this Jan. 25, 2010 file photo, cars from AeroTrain pass behind glass security barriers at Washington Dulles International Airport in Washington. New York City transit officials are considering similar safety barriers between passenger platforms and trains after two people were pushed and a third fell to their deaths on the tracks since early December 2012. (AP Photo/Jose Luis Magana, File)
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