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Leave the scene. ntsb will begin by mapping the scene usually with a 3-d scanner to produce a complete 3-d representation of the wreckage as it currently exists. then you have a number of functional teams from fra that will each begin to do their own work in unison. you have human factors group. you have a track group. you have a signal group. you also have an equipment group. they will all begin doing their own thing in unison to try and rule in or rule out certain potential aspects of causation. >> robert halstead thank you for your insight. it was so helpful. again, we're expecting this new...

Much faster. and watch how the passenger cars pull off. this is why it was easy for people to talk about speed early on. this accident fit the pattern. we have a whole investigation to complete. but right now, that's why speed keeps coming to the forefront. >> tom foreman, thank you so much. joining me now is robert halstead along with bob francis. thank you both for joining us. mr. francis, let me start with you. the ntsb now saying that this train according to initial data analysis was going in excess of 100 miles an hour around this 50-mile-an-hour curve. some passengers also said before th...

Getting daylight here they start to maybe be able to reconstruct what happened here how long does it take to get some solid answers? >> it's going to be at least one day. it's going to be 24 hour basis until the wreckage is cleaned up. it's going to be 24 hours before we have a good solid handle of what the cause may have been. >> and in your years of working with train stents how does this compare? >> doesn't look good from what i've seen on camera thus far. very interesting to see what the casualty count may have been once you get daylight. >> definitely we foe the five people is been confir...

Of track experts, signal experts, equipment experts, and human factors people. one of the big things, of course is being downloaded the back quarters. that will give us a good handle on human factors. and signal compliance. then they're going to work backward and try to find the first point at which a car derailed. point of derailment. and inspect the track from that point several hundred feet prior to it to see if any track causes may have been contributors. they'll look at track, they're going to look at signals, whether a proper signal was given for the train. you know things of that nature...