Helicopter footage shows train sprawled on river bank

Helicopter footage from NBC News shows the train sprawled across the tracks on one bank of the Hudson River in the north of New York City:

Get the latest pictures and updates on the derailment here

Pictures: Firefighters work to pull survivors from train wreckage

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Derailed US train at three times the speed limit

A New York commuter train that derailed on Sunday, killing four people, was travelling at nearly three times faster than the speed limit, officials said.