New York (CNN) It happened without warning, without time for passengers to realize they were hurtling headlong into a deadly tragedy, without time for commuters standing on the train station platform to flee.

At the height of morning rush hour, a New Jersey commuter train packed with passengers and traveling way too fast crashed into Hoboken Terminal, killing a woman waiting on the platform and injuring more than 100 others.

Witnesses said the train overran its stopping point, slammed into a bumper block, went airborne and hurtled through a passenger concourse at about 8:45 a.m. at the terminal, one of the busiest transit hubs in the New York area.

Fabiola Bittar de Kroon, 34, of Hoboken, was killed, the State Medical Examiner's office announced. Gov. Chris Christie said the woman had been standing on the platform and was struck by debris.

Christie said 114 people were injured.

Bhagyesh Shah, who rode in the back of the front car on his way to work, said the train didn't appear to slow as it entered the station.

"The next thing I know, I'm on the floor. We are plowing through something ... and when the train came to a stop, I could see the parts of the roof on the first car and some of the debris next to me," Shah said.

Images posted on social media showed severe structural damage at the station, where part of the roof appeared to have collapsed. Witnesses described people helping bloodied passengers, some trapped by debris, from the packed front car.

will be examined as investigators try to determine what caused Thursday's crash, said Bella Dinh-Zarr, National Transportation Safety Board vice chairwoman. The crash comes five years after more than 30 people were injured when a train overran its stop at the same station -- whichwill be examined as investigators try to determine what caused Thursday's crash, said Bella Dinh-Zarr, National Transportation Safety Board vice chairwoman.

The engineer -- identified by transit spokeswoman Nancy Snyder as Thomas Gallagher, 48 -- was treated and released from a hospital. He was cooperating with law enforcement officials, Christie said. Gallagher, who has been an employee of New Jersey Transit for 29 years, has yet to speak with the NTSB.

CNN affiliate WABC spoke to Gallagher's neighbor, Tom Jones, who said Gallagher told him his childhood dream was to be an engineer. Jones said the Gallaghers are terrific neighbors. "Just a fine, fine family. Great next-door neighbors, wonderful kids, very caring people about others," Jones said.

Car's roof crushed down to the seats

The train -- which the NTSB said had an engine pushing three passenger cars -- was at the end of a 17-stop route that had begun more than an hour earlier in Spring Valley, New York. The Hoboken hub primarily serves the Lower Manhattan commuter market.

A New Jersey Transit worker at the station said he heard an explosion-like sound as the lead car, coming into the station fast, slammed into the bumper block, a device meant to halt trains that pass their stops.

"It went up and over the bumper block, through the depot ... and came to rest at the wall by the waiting room," worker Mike Larson said.

"It was going considerably faster than it should have normally been."

Half of the first car was crumpled, and the roof crushed down to the seats, he said. The train should have stopped 10 to 20 feet before the bumper block, he said.

Some federal lawmakers said positive train control -- a system that combines GPS, wireless radio and computers to monitor trains and stop them from colliding, derailing or speeding -- might have helped in this situation. Dinh-Zarr, of the NTSB, said part of the focus of her agency's investigation will be on positive train control and whether it could have prevented the crash.

New Jersey Transit has not yet installed positive train control, although it does an older safety system. Congress originally required the newer safety system to be installed by the end of 2015, but extended the deadline to the end of 2018.

Christie and New York Gov. Andrew Cuomo cautioned people to wait until investigations are completed before concluding PTC would have prevented this incident.

"That's speculation that can only be based upon the cause of the accident, and until we know the cause of the accident were not going to be able to know what steps we can take in the future to avoid an accident like this," Christie said.

'I guess it didn't slow down'

Passenger Leon Offengenden said he was in one of the cars behind the lead car when the crash happened.

"The front car is essentially off the rails ... into the building of the station, with the roof sort of collapsed around it," he said.

"The first car was just demolished. The train looked like it went through the stop," Offengenden said. "The first car looked like it catapulted onto the platform into the building. The roof collapsed. There was wire and water (and) everything.

"The lights went out and a few people screamed (when the crash happened)."

Photos: Hoboken, New Jersey, train crash A section of roof lies on the platform after a New Jersey Transit train crashed at the Hoboken station on Thursday, September 29. One person was reported dead, and dozens of others were injured. Hide Caption 1 of 11 Photos: Hoboken, New Jersey, train crash Passengers rush to safety after a train plowed into a platform at Hoboken station. Hide Caption 2 of 11 Photos: Hoboken, New Jersey, train crash Part of the station's roof is collapsed. Hide Caption 3 of 11 Photos: Hoboken, New Jersey, train crash A section of the station's roof lies on the platform. Hide Caption 4 of 11 Photos: Hoboken, New Jersey, train crash Emergency workers and others survey the train after the crash. Hide Caption 5 of 11 Photos: Hoboken, New Jersey, train crash The station is a major transit hub across the Hudson River from Manhattan. Hide Caption 6 of 11 Photos: Hoboken, New Jersey, train crash Images posted on social media show severe structural damage at the terminal. Hide Caption 7 of 11 Photos: Hoboken, New Jersey, train crash The crash happened during the rush-hour commute. Hide Caption 8 of 11 Photos: Hoboken, New Jersey, train crash People are treated for their injuries outside the Hoboken station. Hide Caption 9 of 11 Photos: Hoboken, New Jersey, train crash A man hurt in the crash is treated for a facial injury. Hide Caption 10 of 11 Photos: Hoboken, New Jersey, train crash Emergency workers help an injured person into an ambulance outside the station. Hide Caption 11 of 11

"I was sitting, but I couldn't see the window. I didn't notice that the train was going at an accelerated pace. It was just going," Offengenden said.

"Now, looking back, I guess it didn't slow down. It definitely didn't slow down. There (were) no brakes. All of a sudden, it just crashed. Something happened obviously. ... It's the same feeling as when you get in a car crash."

He said he left the train and "saw a man who had blood just running down his arm. He was wearing a suit and blood was just gushing."

'It kept going and going'

Shah, one of the passengers, said people were thrown around upon impact.

"I was hoping the train would stop now, but it just didn't stop. It kept going and going. At the end of it, it felt like eternity."

He saw people injured.

"There was a woman. ... She was pinned under ... debris next to the first car. There were seven to eight people that tried to pick that (debris) up."

"I saw an old man, too, who had head injuries, trying to get out of the first car."

And this just happened...a train ran into the station in Hoboken #njtransit #prayeveyonessafe #train #hoboken A photo posted by Alyson Hudson (@alyhudson) on Sep 29, 2016 at 5:50am PDT

Rail service suspended

Dinh-Zarr said the NTSB believes it can recover one of the train's two event recorders but it will take some time to get to one in the front car because the building is too dangerous to go into. The locomotive is outside the station, Dinh-Zarr said.

The NTSB hopes video from two cameras on the train will yield clues.

Contractors will have to remove debris from the top of the train before investigators can get into the passenger cars, she said.

Rail service was suspended in and out of Hoboken into the afternoon as a result of the crash.

New Jersey Transit train service is suspended indefinitely, until the damage can be assessed and repaired. NJ Transit posted a customer notice on its website advising commuters of their Friday options.

Engineers determined that the structural integrity of the potion of the station that serves PATH trains is intact, Hammer said.

CNN producer Paul Murphy described a chaotic scene at the station, with the arrival of first responders from various agencies, sirens blaring and nearby streets cordoned off.

"There's only one option for people who don't have a car to get out of Hoboken right now, and that's the bus," Murphy said. "The bus lines are very, very long, and many people are on the phones with work, saying, 'I'm not coming into work today or I'm going to work from home.'"

New Jersey Transit is the "third largest provider of bus, rail and light rail transit in the nation." Roughly 15,100 people board through the Hoboken station each weekday, according to the agency.

State officials have taken recent steps to improve rail safety.

In August, Christie signed a bill prohibiting an engineer from operating a New Jersey Transit train if his or her driving privileges are suspended or revoked due to a conviction for driving under the influence of alcohol or drugs or a related offense.

The law came after an engineer was found to have lost his license for 10 years due to DUI convictions.