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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 who knows training very well. what i didn't realize is there's a train control system in place. if a train is going too fast there is a warning system. so either the engineer can slow the train down manually or it should automatically slow. is that correct? >> yes, it is. and both of those things should