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Engineer. that's a big difference. the conductor does ticketing. you've seen the conductor going up and down the aisles of the train. the engineer is the one who's operating the train. so whatever data that this engineer is able to download to the police and to investigators will be massively significant in all of this brooke. >> absolutely. as you mentioned, that event recorder sitting in wilmington, delaware going through that piece by piece, figuring out the what the why. ashlee thank you. let me bring in cnn's safety analyst. i want to hit home this point of speed. i was talking to someone...

Administration. the fra says that accidents are declining going decreasing. joining us now is an adjunct professor with the railway program at michigan state university. sir, great to have you with us. in your experience how does a crash like this happen? from the wreckage that you have seen, what would your assertion be? >> when the investigators look at the pictures they see a train where all of the cars rolled over on the outside of the curve, and that means that they will be looking at whether or not the train was going too fast around the curve. then they have to find out why was it going...

Apparently the train was believed to have been going over 100-mile-an-hour when is it crashed. that's just into us. let's talk about it. a former safety official with the federal railroad administration is with me. paul ginsburg is with me as well a forensic audio expert who's examined recordings for the federal government in multiple high-profile criminal cases. let's get right to it. george first to you. we had heard obviously speed could potentially be a factor around that curve, especially when you look at the trajectory of how those train cars flew off those tracks. when you hear 100 mile...

It also could be be the train control system and what concerns me in this accident this area should have come under basic positive train control system in the end of 2012. >> positive train control, so our viewers know that is a system that is leak a autopilot of the plane. it regulates the train. >> it controls the speed of the train and makes sure it is safely complying. >> you are saying that the train should have come upper that requirement but obviously was not? yeah even if the engineer failed to do what he's supposed to do and didn't do anything and had a heart attack or whatever. the t...

National transportation train and rapid investigator. what is job one with, russell? >> preserve the evidence at the wreck site and anything that is perishable and gather all of the facts they can related to the different areas of the investigation. >> we have heard reports from outlets like the wall street journal who say the train was doing more than 100 miles per hour on a curve where design speed indicates 50 miles per hour should be the maximum speed. if that is true it is going to be a major factor in the investigation, right? >> correct. that information will focus this investigation on...