NTSB: Amtrak train accelerated from 70 mph to 100 mph just seconds before the crash

Investigators say the Amtrak train that derailed in Philadelphia on Tuesday accelerated just seconds before the crash.

The NTSB's Robert Sumwalt said that video from inside the cabin shows that 65 seconds before the derailment, the train's speed rose above 70 mph, and 16 seconds before the end of the recording, the speed was above 100 mph, twice the speed limit for that section of the tracks. "Seconds into the turn, we could see the train tilting 10 degrees to the right," Sumwalt said. When the train crashed, the recording stopped, and investigators are not sure if the train's speed was increased manually.

Sumwalt also said that engineer Brandon Bostian agreed to speak with investigators, and they will meet "in the next few days." Bostian's attorney, Robert Goggin, told ABC News his client is "very distraught" over the fact that people were killed in the crash, and he has voluntarily submitted a blood sample and gave investigators his cellphone.

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