U.S. investigators don?t k**w if warning device worked in Amtrak crash: NTSB

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U.S. investigators don?t k**w if warning device worked in Amtrak crash: NTSB
WASHINGTON (Reuters) - Investigators probing the May 12 derailment of an Amtrak train in Philadelphia do **t yet k**w whether an electronic warning device was operating or activated before the disaster, National Transportation Safety Board Chairman Christopher Hart told the U.S. Congress on Tuesday.http://i0.wp.com/reuters.us.feedsportal.com/c/35217/f/654201/s/46dd96f8/sc/7/mf.gif?resize=1%2C1
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