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Has sounded the alarm over. saying they are more vulnerable to being breached in a crash. >> there are different type of d.o.t. 111 cars so we will want to be confirming that. >> reporter: critics say oil company have been slow to upgrade the cars. the kind that derailed in quebec this summer killing 47 people. tank cars can withstand impacts at 18 miles an hour. but some say even prooxtd wouldn't protect them going 60, 70, 80. >> you can't physically build a tank that can withstand that kind of impact speed. >> reporter: gary wolf said trains are far safer than trucks. right now the only alte...

Ntsb investigators have now arrived on the ground. >> i think our biggest challenge right now is that the fire is still burning, and we're not able to get up close and personal to the wreckage. >> reporter: crashes like this are calling attention to overall rail safety. 79 people died this summer when a passenger train slammed into a concrete wall in spain. in early december, new york's metro north train derailed, killing four. in north dakota, some of the rail cars may be the type the ntsb has sounded the alarm over, saying they are more vulnerable to being breached in a crash. >> but there a...