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ground on. the head of the rail itself, the condition of it. has it been hammered, has it cracked? there are some pieces to the contact between the train and the rail that come into play here, that they're very complicated and they're going to take some serious expertise to make sure that they were proper and the ntsb does have that expertise. bill: thank you sir very much. john golio, former investigator with the ntsb helping us with analysis. thanks for being part of our program today. >> thank you for having me. bill: we have a couple more hints here but not a lot in philadelphia. martha: a lot to know and the box and the conductor will be key in that investigation of course. we may get more information as we head into the afternoon. we'll keep you posted as we get developments. in the meantime, isis, clearly according to all of the experts on the rise, in the area across the middle east.