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NTSB: Speed a critical factor in Amtrak crash

According to the NTSB, the Amtrak train that derailed in Washington state was traveling 80 mph in a 30 mph zone. CNN's Dave Briggs and Christine Romans has more.
DUPONT, WA - DECEMBER 18: Work crews prepare to clear southbound I-5 lanes at the scene of an Amtrak train derailment on December 18, 2017 in DuPont, Washington. At least six people were killed when several train cars plunged from the bridge. (Photo by Stephen Brashear/Getty Images

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