FILE - In this Dec. 1, 2013 photo, Metro North Railroad engineer William Rockefeller is wheeled on a stretcher away from the area where the commuter train he was operating derailed in the Bronx borough of New York. Federal investigators say Rockefeller, who was engineer on a New York commuter train that derailed last year, killing four people, has a serious sleep disorder. A medical document made available Monday April 7, 2014, by the National Transportation Safety Board says he has "severe obstructive sleep apnea." The NTSB did not say whether the engineer's disorder contributed to the crash.(AP Photo/Robert Stolarik, File)
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