Metro North Railroad engineer William Rockefeller is wheeled away from the area where the train he was operating derailed in the Bronx. The National Transportation Safety Board said the sleep-deprived engineer nodded off at the controls of the commuter train just before taking a 30 mph curve at 82 mph. (AP Photo/Robert Stolarik)

The Metro-North Railroad engineer who fell asleep at the controls while operating a train that derailed and killed four passengers last December was suffering from an undiagnosed case of sleep apnea, reports The Wall Street Journal.

The National Transportation Safety Board (NTSB) released reports today citing sleep apnea as the probable cause in last year’s derailment, and identified the probable causes of four other major Metro-North accidents over the last two years, says The Wall Street Journal.

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