FILE -- In a July 9, 2013 file photo workers comb through debris after a run away oil train derailed July 6, 2013 causing explosions, fire and destoying parts of Lac-Megantic, Quebec. Canadian ... more 
FILE -- In a July 9, 2013 file photo workers comb through debris after a run away oil train derailed July 6, 2013 causing explosions, fire and destoying parts of Lac-Megantic, Quebec. Canadian transportation authorities banned one-man crews for trains with dangerous goods Tuesday, July 23, 2013, responding to calls for tougher regulations after the oil train derailment in Quebec killed 47 people. (AP Photo/The Canadian Press, Paul Chiasson, file) less 
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Associated Press | Photo By The Canadian Press, Paul Chiasson, file
Tue, Jul 23, 2013 5:16 PM EDT