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Santiago is in a rush to get to his construction job. the train, as usual, is packed. >> translator: it was a disaster. very crowded. >> sitting next to santiago is his younger brother. >> translator: we were together talking a bit. he told me we need to get there. i said, yes. we're almost there. >> but the train doesn't stop where it's supposed to, at the platform. instead, it blows right past the end of the line and slams into a barrier wall. >> translator: and that's it. there was an explosion. and i lost consciousness. >> dr. alberto crescenti is one

These investigators are going to be combing through over the next 4 hours. >> and obviously, after every train crash, there's a talk about positive train control that would have prevented this accident from happening. give us a sense of what exactly it is and how it works. >> well, in the northeast corridor, these trains that go-between cities like washington, d.c. and new york, as was the case, was supposed to be the case with this train, this type of system is already in place. it's automated speed control. so if the train doesn't slow down, if the engineer doesn't bring it down to the speed...

The train, rests with the engineer. the conductor is inside the train attending to the passengers. he has the title of being the one in charge of the entire train crew. train doesn't move until the conductor says so but as far as adhering to speed restrictions, wayside signals, the conductor's inside the train and he can't see where he is at at any one particular time. >> i ask that question amtrak their official responsibilities for the conductor and the engineer, it cites radio speed restrictions, so i was trying to understand the checks and balances in place to alert the engineer or remind ...

>> translator: it was a disaster. very crowded. >> sitting next to santiago is his younger brother. >> translator: we were together talking a bit. he told me we need to get there. i said, yes. we're almost there. >> but the train doesn't stop where it's supposed to, at the platform. instead, it blows right past the end of the line and slams into a barrier wall. >> translator: and that's it. there was an explosion. and i lost consciousness. >> dr. alberto crescenti is one of the first responders on the scene.

Santiago is in a rush to get to his construction job. the train, as usual, is packed. >> translator: it was a disaster. very crowded. >> sitting next to santiago is his younger brother. >> translator: we were together talking a bit. he told me, my boss called me, we need to get there. i said, yes. we're almost there. >> but the train doesn't stop where it's supposed to, at the platform. instead, it blows right past the end of the line and slams into a barrier wall. >> translator: and that's it. there was an explosion. and i lost consciousness. >> dr. alberto crescenti is one of the first respo...