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Investigators probing a rail accident which killed six people near New York City say the train was within the speed limit for that section of track, the BBC reported.

The crash happened after a mother-of-three stopped her car on a level crossing north of the city.

She was killed in the subsequent inferno along with five train passengers.

Accident investigators also said there were no problems with the signals or barrier at the site of the collision.

But they remain unaware why the driver, 49-year-old Ellen Brody, became stranded on the crossing at Valhalla, about 20 miles (32km) north of New York City.

An official from the National Transportation Safety Board, the federal agency leading the probe, said on Thursday that a witness in a nearby car had seen Ms Brody stop on the crossing in the moments before the train approached.

Investigator Robert Sumwalt said that the barrier was seen to come down on the rear of the car, a Jeep Cherokee, at which point Ms Brody got out and appeared to inspect the damage.

He said that, according to both the witness and the train driver, after returning to the car she suddenly drove forward slightly - straight into the path of the oncoming train.

Data retrieved from the train's recording device suggested it was travelling at 58mph (92km/h) an hour, added Mr Sumwalt - just below the 60mph speed limit for that section of track.

In addition to the six deaths there were 15 injuries, seven of them serious.

The electrified third rail of the track came through the front carriage of the train after the crash, setting it on fire.

Passengers had to escape from the rear carriages.