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Deadly Metro North train derailment in NYC

Workers are seen on the tracks of the Metro-North train derailment in the Bronx borough of New York December 3, 2013. The driver of a New York commuter train that derailed on Sunday, killing four people, told investigators he "lost focus" and went into a daze shortly before the crash, according to a law-enforcement source. (REUTERS/Shannon Stapleton)

Deadly Metro North train derailment in NYC

Federal regulators on Thursday launched a 60-day safety assessment of Metro-North Railroad following the December 1 derailment that killed four people and left 70 others injured, officials said.

Teams will review the commuter railroad's compliance with federal regulations, its procedures and practices and its safety culture, according to a statement by the U.S. Department of Transportation.

Federal investigators have said the early morning train from Poughkeepsie was traveling nearly three times the 30-mile-per-hour speed limit when it left the tracks near the end of its run to New York's Grand Central Terminal. (AP

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