7 Killed, 10 Passengers Critically Injured in Amtrak Derailment

Investigators say the train was going more than 100 mph, double the speed limit for that curve.
3:59 | 05/14/15

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Transcript for 7 Killed, 10 Passengers Critically Injured in Amtrak Derailment
we begin here with the haunting images from inside the train, moments after it came to a deafening halt. Tonight, the frantic images from inside the mangled cars, right after the train derailed. The passengers thrown from their seats. Luggage sent flying through the air. There's people stuck in here. They can't get out. Reporter: Passengers helping one another, calling out to each other. Is everybody out of this car? Reporter: After those seven cars came to a screeching halt, those passengers knew they had to get out. I got you, okay? Okay? Keep crawling, okay? Reporter: Outside the train, in the dark, the passengers stunned. Was there any warning at all before this happened? No, no. Basically the train tilted over and rolled. Reporter: 7:10 P.M., amtrak 188 leaving Washington, D.C. 238 passengers on board, five crew members. 9:28 P.M., the first call, the train ripping from the tracks on a sharp curve in Philadelphia's Frankford neighborhood. Moments later, the emergency calls. We're going to classify this as a mass casualty incident. One train looks like it's completely in pieces. Reporter: The urgent search for passengers in the darkness. Rescuers using flashlights. Surrounded by the twisted cars. Three on their sides. One upside down. The others off the tracks. We have people on the tracks and a couple of cars overturned. Reporter: And almost immediately, the images of the walking wounded. Covered in blood, but alive. Many climbing out through windows. Some climbing up onto seats, to crawl out through the roof. Beth davidz told me she was among them, the scratches to her face. All I just remember is it felt like a turn. You could just feel, like, then you knew it was more than just a turn. I mean, because the whole car was turning on its side. And then it was just kind of a slow moment of darkness as you're kind of tumbling with people and things and chairs and, I mean, all the seats were falling. Reporter: The passengers everywhere needing help. First responders helping this man get medical help. So many patients, they used buses to get them to area hospitals. Many limping and unsteady. More than 200 treated at local hospitals, ten in critical condition tonight. Inside the trauma ward, doctors telling me the severity of the injuries revealed just how far and how fast these passengers were thrown. The moment you saw these injuries, you said, this is consistent with a train derailment. Absolutely. They had some broken bones, bruising, they had cuts and scrapes. Mostly everybody was what we call blunt trauma. Reporter: Overnight, they were still searching for loved ones they were waiting for word on. We had a work meeting and she left at 8:46 to get on the 9:00 and her husband, she had told she was on the train. Reporter: That mother still missing tonight. From the sky, you could see the engine detached. Seven cars off the tracks. At daybreak today, the scope of the disaster revealed. 6:00 A.M. Federal investigators on the scene here this morning. They've been here all night long. And if you look, you can see one of the cars actually leaning there. Investigators right at the tail end there right on the tracks, above the telephone poles that have been drawn in during the derailment. Obviously the big question this morning, the big a role did speed play in this? Did the turn in the track actually play a role, too. Tonight, investigators revealing the train going more than 100 miles per hour. They expect the box to reveal even more critical clues. ABC news has learned the train engineer gave initial statements to police detectives here, and today, met for a time with federal investigators. As authorities also reveal some of the 238 passengers on board are still unaccounted for tonight. As Leonard, a husband and father, recovers. This was his first time taking the train, trapped underneath. He told me he remembers the officer who held his hand. One cop held my hand, which made me feel comfort. That patient telling me he hasn't slept yet, safing that every time he closes his eyes, he feels like they're crashing

This transcript has been automatically generated and may not be 100% accurate.

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