The incident occurred when the vehicle collided with another freight train at a combined speed of more than 80 miles per hour. It is listed as one of the worst rail catastrophes in modern California history, according to the LA Times.
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Though there are currently rules against cell phone usage and other distracting activities in place for engineers, officials from the NTSB claim that they are currently unenforceable.
"Technology has the ability to increase the number of distractions, but it also has the ability to increase safety in the cab," Deborah A.P. Henson, chairwoman of the NTSB, told the New York Times. "It's a new paradigm, this area of distractions; it's changing how humans behave. It's our hope that the recommendations today will change how humans perform."