(PHILADELPHIA) — The engineer driving the Amtrak train that derailed survived the Tuesday-night crash and will play a key role in the investigation.
The identity of the engineer has not been publicly released, but authorities said he has already met with investigators.
Philadelphia Mayor Michael Nutter said Wednesday that the engineer suffered unspecified injuries and has received medical care.
The engineer has since been interviewed by Philadelphia police and gave initial statements to detectives, although the details of what he said have not been made public.
ABC News can confirm that they were reportedly meeting with federal accident investigators and other rail personnel Wednesday afternoon.
The National Transportation Safety Board announced that preliminary data indicated that the train’s speed exceeded 100 mph.
There is a 50-mph limit at the curve where the train derailed, so the reason why the train was going in excess of twice the limit will be one of the biggest questions facing investigators.
The engineer was one of five Amtrak employees on board the New York City-bound train when it derailed around a bend shortly after leaving a stop in Philadelphia.
Seven people died in the crash, and Nutter said that more than 200 people were treated at local hospitals.
The NTSB was also involved in the investigation into the December 2013 Metro North train derailment outside of New York City, where the engineer was found at fault because he dozed off and the train was going nearly three times the speed limit at the curve where the crash occurred.
Four people died in that crash and approximately 60 others were injured. The engineer was suspended without pay and is involved in a number of civil suits, though he has not faced any criminal charges.
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