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More than three dozen freight cars derailed Feb. 3, 2023, on the outskirts of East Palestine near the Pennsylvania border, including 11 carrying hazardous materials. Some residents were evacuated that night, but days later more had to leave their homes amid fears of an imminent explosion. Despite potential health effects, officials intentionally released and burned toxic vinyl chloride three days after the crash, sending flames and smoke into the air.

At the end of the meeting, NTSB Chair Jennifer Homendy accused Norfolk Southern of interfering with the investigation and abusing its status as a party to the probe to help gather information.

鈥淣orfolk Southern鈥檚 abuse of the party process was unprecedented and reprehensible,鈥� she said.

Numerous times, Homendy said, the railroad delayed or failed to give investigators information. Twice, Homendy called the railroad at the request of investigators and threatened to issue subpoenas for information, she said.

A railroad contractor told investigators that it did not take or keep records of temperature changes on the tank cars containing vinyl chloride, she said. But the NTSB suspected otherwise.

鈥淲e found through text messages through one of their employees, who provided that information in later interviews that they did keep those records,鈥� Homendy said. 鈥淚t took about two months before the team received those texts and the emails."

Some of the findings discussed Tuesday weren鈥檛 a surprise because the NTSB has released quite a bit about this investigation already, but the hearing revealed the most details yet about the and the failure of trackside detectors to catch its soaring temperatures. The board also delved into why the decision to the vinyl chloride was flawed.

After discussing how a trackside detector in Salem, Ohio, failed to accurately measure the bearing's temperature, NTSB investigators said that Norfolk Southern and its contractors compromised the integrity of the vent-and-burn decision by withholding information from Oxy Vinyls, the company that made the vinyl chloride, and evidence that the tank cars were cooling after the crash.

The officials who made that decision said they never received any information suggesting the vent and burn wasn't their only option.

鈥淣orfolk Southern and its contractors continued to assert the necessity of a vent and burn, even though available evidence should have led them to re-evaluate their initial conclusion,鈥� investigator Paul Stancil said.

The railroad defended the decision again Tuesday and said it was based on more than just the temperature readings. Officials also had concerns about the way the pressure-relief devices malfunctioned on the tank cars though Homendy said some of those fears were misplaced based on what investigators learned. Norfolk Southern added that nothing kept Oxy Vinyls from joining the discussion in the command center and sharing its opinion about the tank cars.

Oxy Vinyls experts testified at earlier NTSB hearings they were certain a feared chemical reaction that could have caused those tank cars to explode wasn鈥檛 happening. Oxy Vinyls didn鈥檛 address the questions about its role in the vent and burn decision in a statement Tuesday.

Norfolk Southern emphasized in its statement that it recommended the vent and burn because of safety concerns. Homendy said that in a private meeting two weeks ago a senior company executive told the board that Norfolk Southern wanted to put to rest the 鈥渞umor鈥� that the railroad made that decision to get trains moving again more quickly..

The exchange ended, she said, with what she said was a threat from the railroad.

鈥淚t was delivered that way to use every avenue and opportunity to vigorously defend their decision-making in media and hearings going forward. That is your right. But it is not our role to defend Norfolk Southern. We鈥檙e here to protect the American people and the traveling public,鈥� Homendy said.

Norfolk Southern had just issued a lengthy statement promising to study the NTSB's recommendations and work to improve safety shortly before Homendy launched into her rebuke. In response, railroad spokesman Tom Crosson said Norfolk Southern always tried to provide the NTSB all the relevant information they needed.

鈥淎t all times, Norfolk Southern cooperated fully and ethically with the investigation with full transparency,鈥� Crosson said.

But the top safety expert at the largest rail union who was part of the NTSB investigation said that while these findings highlight concerns about Norfolk Southern, he worries about all the major Class I railroads' commitment to safety. Jared Cassity with the SMART-TD union said Union Pacific's recent efforts to is one of the latest examples.

鈥淪he made NS sound like they鈥檙e on an island by themselves. But in my opinion, all the Class Ones are kind of a same beast,鈥� Cassity said.

East Palestine resident Misti Allison said the community is still worrying about potential health effects from the vinyl chloride and toxic cocktail of other chemicals that spilled and burned in the derailment, and now they know the railroad hasn鈥檛 always been forthcoming.

鈥淐ommunity members deserve transparency and proactive protection, not the silence, secrecy and manipulation that has been unveiled today about Norfolk Southern,鈥� Allison said.

The NTSB said first responders need good guidance of when to consider the last resort of a vent and burn to protect lives. Until recently, they didn't even have access to previous reports on the topic because railroads had insisted they were sensitive safety information.

Norfolk Southern has already settled with the federal government and announced a with residents. So it's not clear how many additional consequences the railroad could face other than continuing to pay for the cleanup EPA is overseeing. But Ohio and Pennsylvania haven't wrapped up their investigations, so the states may still do more to hold Norfolk Southern accountable.

Though NTSB recommendations aren't binding, Congress may be willing to enforce some of them because of the crash鈥檚 spotlight on rail safety.

More than a year ago, a bipartisan group of lawmakers led by Ohio's two senators of reforms including requiring two-person crews and setting standards for the inspections and detectors that help prevent derailments. The in the U.S. Senate under resistance from Republicans and the railroads.

鈥淭he findings shared by NTSB Chair Homendy today confirm many of my worst fears,鈥� Ohio Sen. JD Vance said. 鈥淭he derailment and subsequent chemical explosion were preventable tragedies resulting from a series of errors made by Norfolk Southern and its contractors."

With limited success, federal regulators also pushed for the railroads to make changes like signing onto an to report safety concerns. The industry responded to the crash by promising to install more trackside detectors, review the way they are used and help first responders improve their handling of derailments with more training and better access to information about the cargo.

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Funk contributed to this story from Omaha, Nebraska, and Krisher from Detroit.