About 300 people were escorted from a NJ Transit train Saturday as new problems and questions have arisen following a fatal Hoboken crash this week, reports said.
National Transportation Safety Board experts were also looking for clues from the train's black box recorders. "We want to get there as quickly as possible, but we want to get there safe", O'Neil said.
Some rail lines -including New Jersey Transit - threatened to shut down completely if it was enforced.
A source familiar the investigation tells CBS News that after months of concern about a "leadership vaccum" at New Jersey transit, federal regulators launched a "deep audit" of the agency's operations in June.
More than 100,000 people use NJ Transit trains to commute from New Jersey into New York City daily.
That recorder should show what was ahead of the train before it crashed. They were still working to access a second recover that would have access to the forward-facing camera.
Information from the Associated Press was included in this story.
The Hoboken terminal is a major transfer point for New Jersey trains and buses as well as ferries and the PATH commuter train that take passengers to NY.
The Federal Rail Administration and the National Transportation Safety Board have been on the scene to investigate. An investigation determined excessive speed was the main cause of the accident.
"While we are just beginning to learn the cause of this crash, it appears that once again an accident was not prevented because the trains our commuters were riding lacked positive train control", said Rep. Sean Patrick Maloney, D-N.Y.
One person was killed.
"The lights went off, and then you started to see like - I was in the window seat, so I could see like outside, what was happening, and the roof just collapsed on the first vehicle".
Two other people suffered life-threatening injuries, and dozens of others are being treated for minor injuries at area hospitals, officials said. Those patients are in guarded condition, which is a step above critical condition.
"He's OK, he's good, " she said outside of his home in Morris Plains, NJ.
The crash also injured 114 people, New Jersey Governor Chris Christie told CNN.
U.S. federal investigators have recovered one of the black box recorders from the wrecked commuter train at New Jersey's Hoboken station as inquiries continue into what caused it to crash, killing one person and injuring more than 100 others. He was "cooperating" with investigators. They say it marks the first time that the NTSB has used a drone to document a rail accident.
A spokesman for New Jersey Transit didn't immediately respond to a request for comment.
In 2011, a Port Authority Trans-Hudson, or PATH, commuter train crash in a separate section of the Hoboken station injured more than 30 people. There is expanded bus service.
"The one thing we know for sure is that the train came into the station too fast".
A 34-year-old mother was killed by falling debris during the crash Thursday and more than 100 others were injured.
It apparently knocked out pillars as it ground to a halt in the covered waiting area, collapsing a section of the roof onto the first vehicle.