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Cars. thursday morning an eighth body was discovered. >> the dog hit on a couple of spots and we were able to find one other passenger in the wreckage. >> reporter: authority say all 233 people on board have been accounted for. as crews work to repair the tracks, ntsb investigation continues. they've taken 3-d imaging of the cars and continue to analyze the train's recordings. the other high priority, interviewing the train's crew including engineer, 32-year-old brandon bostian. >> i'm pleased to report we have contacted the not ji here in an he has agreed to be interviewed by the ntsb. we loo...

>> we will have positive train control on the northeast corridor section by december 31st. >> to push you a little bit, some would say, congress says you have to have it by december 2015. why don't have you it now? is it a issue after cost? >> it is time issue and cost. >> now the hope is to reopen them by early next week. renee marsh, cnn, philadelphia. >> many experts are asking if the automated speed control system, the ceo was talking about in that report, also called positive train control would have worked. >> positive train control is the matrix of information about all of the trains ou...

Next part of it, relay stations along the tracks themselves. to tell them where switches are p. what position they're in. potential hazards, crossings and overall ground patrol effort which brings all of that information together and turns it into one simple graphic that would show up for any engineer out there. showing him or her precisely when the train need to be slowed down. how much time it'll take at that weight and at that length after train, that sort of thing and if they do not responding with if the engineer does not showdown when the hazard is up a ahead. commuter would take over. t...