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Of liquid material safely every year. so, is there a growing problem about accidents? what is really the state of train safety in this country, right now? >> reporter: that is the important question, jenna. there is growing concern about all this. outgoing, ntsb chairman debra hersman. they moved everything safely, one or two tank cars and part after much larger train. today whole trains may be comprised of 100 tank cars carrying hazardous liquids. train tracks run through the backyards of milli...