CNN Anderson Cooper 360 May 14, 2015 00:22:00
Train control. amtrak calls it asis. ptc is a gps based system so it knows where the train is and what the anything nalls are signaling. >> and if it was present, it could automatically slow the train down. >> absolutely. it would prevent derailments due to overspeed. >> and we know about how it works with train crashes, but how do you go about -- i know your investigators will be on-site here but the investigation goes on longer than that. >> and we are on scene to collect the perishable evidence the information that can go away like the passage of time. like the train cars and witness or sur...
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