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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. theyve taken 3-d imaging of the cars and continue to analyze the trains recordings. the other high priority, interviewing the trains crew including engineer, 32-year-old brandon bostian. >> im pleased to re...

>> 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 dont 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 w...

Next part of it, relay stations along the tracks themselves. to tell them where switches are p. what position theyre 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 itll take at that weight and at that length after train, that sort of thing and if they do not responding...