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Investigators from the National Transportation Safety Board were meeting on Friday with Brandon Bostian, the engineer of the Amtrak train that crashed in Philadelphia, sources told NBC News.

There was no immediate word on where the meeting was taking place. The NTSB was expected to brief reporters on Friday afternoon.

Investigators want to know why the train sped up from 70 mph to more than 100 mph at a curve where the speed limit is 50. The derailment killed eight people and injured more than 200.

Bostian’s lawyer told ABC News that his client does not remember the crash. He also said that the engineer was not using his cellphone, drinking or on drugs.

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