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Derailment. the focus this morning, what we are not wrong. >> the only thing i can tell you is the one obvious thing or the one known fact. there is a curve. we have no idea what kind of speed we are talking about, what else happened out there. we are not going to speculate on them. >> what clues do crews need to look for. joining us to weigh in is railroad signal an accident reconstruction expert robert halstead. thank you for joining us this morning. >> good moaning. >> you have investigated o...