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Emergency personnel work at the scene of a deadly train derailment, Wednesday, May 13, 2015, in Philadelphia. The Amtrak train, headed to New York City, derailed and crashed in Philadelphia on Tuesday night, killing at least six people and injuring dozens of others. (AP Photo/Patrick Semansky)
Emergency personnel work at the scene of a deadly train derailment, Wednesday, May 13, 2015, in Philadelphia. The Amtrak train, headed to New York City, derailed and crashed in Philadelphia on Tuesday night, killing at least six people and injuring dozens of others. (AP Photo/Patrick Semansky)

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    Amtrak train sped up before flying off tracks

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Amtrak train sped up before flying off tracks

The NTSB said Amtrak 188 sped up going into 50 mph curve. CNN's Rene Marsh reports.

Amtrak train sped up before flying off tracks

The NTSB said Amtrak 188 sped up going into 50 mph curve. CNN's Rene Marsh reports.