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NEW YORK, NY - DECEMBER 2 :  Cranes lift the derailed train wagons near the Spuyteh Duyvil station on December 2, 2013 in New York City . The Metro-North passenger train derailed en route to New York City near the Spuyten Duyvil station, killing four people and wounding 63 others on December 1, 2013 in the Bronx borough of New York City. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)
NEW YORK, NY - DECEMBER 2 :  Cranes lift the derailed train wagons near the Spuyteh Duyvil station on December 2, 2013 in New York City . The Metro-North passenger train derailed en route to New York City near the Spuyten Duyvil station, killing four people and wounding 63 others on December 1, 2013 in the Bronx borough of New York City. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)

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Union: Engineer nodded off before crash

Engineer of derailed train that killed four tells investigators he was in a daze before the crash. Nic Robertson reports.

Union: Engineer nodded off before crash

Engineer of derailed train that killed four tells investigators he was in a daze before the crash. Nic Robertson reports.