Disaster_Accident

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Emergency personnel work the scene of a deadly train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia. (AP Photo/ Joseph Kaczmarek)

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Emergency personnel work the scene of a deadly train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia. (AP Photo/ Joseph Kaczmarek)

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Emergency personnel work the scene of a deadly train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia on Tuesday night, mangling the front of it, tearing the cars apart and killing several people.(AP Photo/Matt Slocum)

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Emergency personnel help a passenger at the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia. (AP Photo/Joseph Kaczmarek)

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Police and Fire Rescue personnel work the scene of a deadly train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia on Tuesday night, mangling the front of it, tearing the cars apart and killing several people. (Tom Gralish/The Philadelphia Inquirer via AP) PHIX OUT; TV OUT; MAGS OUT; NEWARK OUT

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Authorities investigate the scene of an Amtrak train crash Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia. (AP Photo/Paul Cheung)

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Emergency personnel work the scene of a deadly train wreck, early Wednesday, May 13, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia on Tuesday night, mangling the front of it, tearing the cars apart and killing several people. (AP Photo/Matt Slocum)

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Emergency personnel work the scene of a deadly train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia on Tuesday night, mangling the front of it, tearing the cars apart and killing several people.(AP Photo/Matt Slocum)

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Emergency personnel work the scene of a deadly train wreck, early Wednesday, May 13, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia on Tuesday night, mangling the front of it, tearing the cars apart and killing several people. (AP Photo/Matt Slocum)

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Emergency personnel work the scene of a deadly train wreck, early Wednesday, May 13, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia on Tuesday night, mangling the front of it, tearing the cars apart and killing several people. (AP Photo/Matt Slocum)

Amtrak Crash.JPEG-0bbca.jpg

Emergency personnel work the scene of a deadly train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia on Tuesday night, mangling the front of it, tearing the cars apart and killing several people.(AP Photo/Matt Slocum)

Amtrak Crash.JPEG-06f5e.jpg

Emergency personnel work the scene of a deadly train wreck, early Wednesday, May 13, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and tipped over in Philadelphia on Tuesday night, mangling the front of it, tearing the cars apart and killing several people. (AP Photo/Matt Slocum)