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(Bloomberg) — The people investigating the fiery commuter rail accident in New York are looking into why the electrified third rail that powers the train became dislodged during the crash and whether it contributed to the severity of the casualties.

It’s not yet clear if the electricity to the track shut off automatically as it is supposed to do in an accident, Robert Sumwalt, a member of the U.S. National Transportation Safety Board, said Wednesday at a news briefing near the crash site in Westchester County, New York.

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