FILE - In this May 13, 2015, file photo, emergency personnel work at the scene of a deadly train derailment in Philadelphia. The Amtrak train, headed to New York City, derailed and crashed in Philadelphia on May 12, killing at least six people and injuring dozens of others.  Congress has passed a bill that delays for at least three years the mandate for railroads to put long-sought safety technology in place, and extends the government's authority to spend money on highway programs.(AP Photo/Patrick Semansky, File)
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