VALHALLA, N.Y. (AP) -- Federal investigators began examining the burned-out wreckage at the site of a deadly commuter train crash Wednesday, looking for clues that might explain the baffling behavior of a woman whose SUV was stopped between the descending crossing gates.

Emergency personnel look over the site of a collision between a Metro-North Railroad train and an SUV in Valhalla, N.Y
Emergency personnel look over the site of a collision between a Metro-North Railroad train and an SUV in Valhalla, N.Y (AP Photo/Seth Wenig)
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Six people were killed in the rush-hour collision between the train and the SUV Tuesday evening.

National Transportation Safety Board officials were looking at the train's black-box-style recorders, seeking to learn how fast the train was going, whether its brakes were applied and whether its horn was sounded as it approached the crossing where it slammed into the SUV, NTSB vice chairman Robert Sumwalt said.

Investigators also planned to look at the track signals' recording devices, interview the Metro-North train's operators, peer into the wreckage with laser-scanning devices and seek aerial footage, he said.

"We intend to find out not only what happened, but we want to find out why it happened," he said at the crash site in Valhalla, about 20 miles north of New York City.

Meanwhile, officials were using dental records to identify the badly burned victims - five men on the train and the female SUV driver, officials said.

It was the deadliest accident in the history of one of the nation's busiest commuter railroads - one that has come under harsh scrutiny over a series of accidents in recent years.

Several people remained hospitalized, at least two with critical or serious injuries, as officials said they were mystified by the ghastly crash.

"It's really inexplicable, based on the facts we have now," Gov. Andrew Cuomo said on WCBS-AM radio.

"If there was an engineer problem or a train problem or an equipment problem, we'll learn from it," he said on "CBS This Morning." "But sometimes there are just accidents."

A police officer looks at a SUV that was crushed and burned at the front of a Metro-North Railroad train
A police officer looks at a SUV that was crushed and burned at the front of a Metro-North Railroad train (AP Photo/Mark Lennihan)
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The wreck happened in an area where the tracks are straight but car traffic can be tricky, as drivers exiting or entering a parkway turn and cross the tracks near a wooded area and a cemetery.

The driver had gotten out of her Mercedes SUV momentarily after the crossing's safety gates came down around her and hit her car, according to the driver behind her, Rick Hope.

"I said to myself, `The clock is ticking here, the gate is down, the bells are ringing - what are you going to do here?' " he told WNYW-TV. "She looked a little confused, gets back in the car and pulls forward" on the tracks.

Westchester County Executive Rob Astorino said it appeared that the woman got out to lift the crossing gate off her vehicle.

Railroad grade crossings typically have gate arms designed to lift automatically if they hit a car or other object on the way down, railroad safety consultant Grady Cothen said. The wooden arms are designed to be easily broken if a car trapped between them moves forward or backward, he said.

As of Wednesday morning, transit officials hadn't found any problems with the tracks or signal, Astorino said.

It was not the first deadly crash at the site: A Metro-North train hit a truck, killing its driver, at the same Commerce Street crossing in 1984, according to Federal Railroad Administration records. The driver didn't stop before the collision.

Authorities said the impact of Tuesday's crash was so powerful the electrified third rail came up and pierced the train, and Cuomo said the SUV's gas tank apparently exploded, starting a fire that consumed the SUV and the train's first car, which was left blackened and mangled, its roof twisted sideways. The SUV, pushed about 400 feet, looked as though it was stuck on the front of the train.

Emergency personnel work at the scene of a Metro-North Railroad passenger train and vehicle accident in Valhalla, N.Y
Emergency personnel work at the scene of a Metro-North Railroad passenger train and vehicle accident in Valhalla, N.Y (AP Photo/Seth Wenig)
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Elizabeth Bordiga was commuting home from her nursing job at NYU Langone Medical Center in New York City when she suddenly felt the train jerk a few times. Initially, she and other passengers in the middle part of the train started calmly walking to the back. But then they started smelling gasoline, "and somebody said, "There's a fire," she recalled Wednesday by phone.

But they couldn't open the emergency window or figure out how to escape until a firefighter in the train got a door open, she said. Commuters lifted each other down from the train to the ground about 7 feet below, said Bordiga, who uses a cane and couldn't jump.

"When I was on the ground, I looked to the right and saw flames. I couldn't believe it," she said.

In the train's first car, Christopher Gross was hurled onto the floor, hearing screams and seeing flames about a foot from his head and a fellow passenger whose leg had been amputated below the knee.

"It's life or death at this point," he recalled Wednesday on ABC's "Good Morning America." And then, he said, a man whose hands were burned elbowed open the emergency exit latch, allowing some of the train's roughly 700 passengers to escape.

The train's engineer tried to rescue people until the smoke and flames got so severe that he had to escape, Astorino said.

Every day, trains travel across more than 212,000 highway-rail grade crossings in the U.S. There are an average of 230 to 250 deaths a year at such crossings, down over 50 percent from two decades ago, according to the FRA.

Metro-North is the nation's second-busiest commuter railroad, after the Long Island Rail Road. It was formed in 1983 and serves about 280,000 riders a day in New York and Connecticut.

Late last year, the NTSB issued rulings on five Metro-North accidents that occurred in New York and Connecticut in 2013 and 2014, repeatedly finding fault with the railroad while also noting that conditions have improved.

Among the accidents was a 2013 derailment that killed four people, the railroad's first passenger fatalities, in the Bronx. The NTSB said the engineer had fallen asleep at the controls because of a severe, undiagnosed case of sleep apnea.

Last March, the FRA issued a stinging report on Metro-North, saying it let safety concerns slip while pushing to keep trains on time. Railroad executives pledged to make safety their top priority.

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