Photos: Scenes from the New York City train crash recovery

New York City train derails
The wreckage of a Metro-North commuter train lies on its side after it derailed just north of the Spuyten Duyvil station Dec. 1, 2013 in the Bronx borough of New York City.
Christopher Gregory/Getty Images

Federal authorities on Monday were beginning an exhaustive investigation into what caused a New York City commuter train rounding a riverside curve to derail, killing four people and injuring more than 60 others.

The locomotive of the Metro-North train was hoisted back on the track at 4:20 a.m., and two cranes were in place to lift the rest of the toppled cars pending approval of the National Transportation and Safety Board, spokesman Aaron Donovan said.

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