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Cranes have now been brought in as authorities try to determine if anymore people are under that wreckage. we know at least six people were killed and more than 200 people were treated at local hospitals. officials say 243 people were onboard the train headed from washington to new york. ntsb investigators on the scene now and the train's data recorders or black boxes as we know them have been recovered. joining us now from a helicopter over the scene, nbc's tom costello. from your vantage point, what can you tell us regarding -- >> reporter: yeah, good day, we are 2,000 feet above this train ...

Speed relationship to the signal system that's telling him what to do. so there's a lot of work that's already in progress. >> we heard -- >> remember when you get an event recorder which is what they call the recorders on the vehicle, and it says the operator applied the brakes well, then we're going to go look at the train itself and see if there's evidence he applied the brakes. so it's a set of checks and balances and everything that the ntsb does. >> john we heard amtrak officials and the mayor say there are things they know at this point things they do not know. from your expertise and b...

Recorder that's expected to shed more light on why that train derailed. ntsb investigators are still combing through the wreckage for clues and the company is cooperating fully with its investigation. >> amtrak will do everything in its power to assist in the investigation and brought every resource to support that effort. this is the amtrak family. we are very saddened by what's occurred and will do everything in our power to work with the mayor's office ntsb and all authorities to do everything possible in dealing with this tragedy. >> the train was heading to new york from washington, d.c. ...

That works the cafe cart ms. bryant, she was thrown around like a pinball, she was standing up when that train went tamron. even though she was very shocked and unstable she was there getting ice, napkins, giving them to people to put on their heads. a lot of people mostly everyone was bleeding from somewhere. >> patrick, thank you so much for joining us. i know you have been on the air all day describing what you saw and i know your family you were able to reach out to your wife and kids so we're appreciative you stuck around to talk with us. thank you. john golia is a former ntsb board membe...