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Emergency personnel work at the scene of a deadly train wreck, Wednesday, May 13, 2015, in Philadelphia. More than 200 people aboard the Washington-to-New York train were injured in the derailment that plunged screaming passengers into darkness and chaos Tuesday night. (AP Photo/Patrick Semansky)
Emergency personnel work at the scene of a deadly train wreck, Wednesday, May 13, 2015, in Philadelphia. More than 200 people aboard the Washington-to-New York train were injured in the derailment that plunged screaming passengers into darkness and chaos Tuesday night. (AP Photo/Patrick Semansky)

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    Train accelerated from 70 mph to more than 100 mph

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Train accelerated from 70 mph to more than 100 mph

Investigators say that the Amtrak train was speeding up before it crashed. CNN's Rene Marsh reports.

Train accelerated from 70 mph to more than 100 mph

Investigators say that the Amtrak train was speeding up before it crashed. CNN's Rene Marsh reports.