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Emergency workers were on the scene quickly after the crash
The US authorities have begun an investigation into the causes of Sunday's train crash in the Bronx area of New York in which four people were killed and more than 60 injured.
The 05:54 from Poughkeepsie to Grand Central Station derailed as it went into a bend in the railway line near Spuyten Duyvil station.
Reports say it was travelling faster than the speed limit in the area.
The train's event recorder, similar to a flight recorder, has been recovered.
The National Transportation Safety Board (NTSB) sent investigators to the site with instructions to inspect the overturned cars and interpret information from the recorder.
The Federal Railroad Administration have also sent their own team of investigators.
NTSB board member Earl Weener said his teams would be on site for several days documenting evidence.
"Our mission is not just to understand what happened, but why it happened, with the intent of preventing it happening again," he said.
Metropolitan Transportation Authority spokeswoman Marjorie Anders said the bend where the derailment occurred was in a slow-speed area.
The train, run by Metro-North, appeared to be going "a lot faster'' than normal as it approached the bend coming into the station, passenger Frank Tatulli told WABC-TV.
The speed limit on the curve is 30mph (50km/h), compared with 70mph in the area approaching it, Mr Weener said.
An official from the Metropolitan Transportation Authority is quoted by the New York Times newspaper as saying that the train operator had reported that it was going into the turn too fast and that he had performed an emergency braking manoeuvre.
The operator told the first rescuers to reach the scene that he had "dumped" the brakes, according to the official, who spoke on the condition of anonymity.
Dumping the brakes is said to be a last-resort move that has the effect of slamming on the emergency brakes on all the cars of a train at once. It is usually done to avert a collision with another train or a vehicle at a grade-level crossing, the New York Times reports.
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Earl Weener, NTSB: "We've okayed the uprighting of the cars to look for any possible further injury or fatalities"
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Two eyewitnesses who live in the area describe the scene
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Doctor Howard Katz says some of the injured had wounds "full of dirt"
A section of line between the Bronx and part of Westchester County could be closed for a week or more and New York state Governor Andrew Cuomo warned commuters to expect long delays.
The train was run by rail service Metro-North that serves commuters from New York City's northern suburbs. It is not part of the New York City subway system.
The accident was the second passenger train derailment this year for the rail service, which, until Sunday, had never experienced a passenger death in an accident in its 31-year history.
On 17 May, an eastbound train derailed in Bridgeport, Connecticut, and was struck by a westbound train. The crash injured 73 passengers, two engineers and a conductor.
Eleven days later, a track foreman was struck and killed by a train in West Haven, Connecticut.
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