In its final report on the toxic derailment in East Palestine, the agency slammed freight provider Norfolk Southern for what it's calling a series of missteps. ABC News' Alex Presha has the details.

Here's a look at what unfolded after a freight train carrying hazardous materials derailed on Feb. 3 near East Palestine, Ohio.

Federal investigators confirmed Tuesday that a hot railcar wheel bearing caused the massive 2023 derailment and fire of a Norfolk Southern train in Ohio.

The crash occurred on Feb. 3, 2023, prompting widespread evacuations.

Researchers estimate that 110 million residents, or one-third of the nation's population, were impacted by pollution.

Whistleblower claims EPA wasted critical time after devastating Ohio train derailment.

Norfolk Southern has agreed to a $600 million settlement to resolve a class action lawsuit related to the train derailment in East Palestine, Ohio, in February 2023.

Norfolk Southern has agreed to a $600 million settlement to resolve a class action lawsuit related to the train derailment in East Palestine, Ohio, in February 2023.

President Joe Biden visited East Palestine, Ohio, on Friday to mark one year since a train derailment spilled hazardous materials and toxins into the environment.

One year after the train derailment in East Palestine, Ohio, some residents are still afraid to return home as they are skeptical of officials deeming tap water safe.

It's been a year since that toxic train derailment and some residents are still reporting health problems.

One year after a freight train derailed and spilled toxic chemicals in East Palestine, Ohio, affected residents said they are still afraid for their safety.

ABC News’ Alex Presha returns to East Palestine, Ohio, where some residents are hesitant to return to their homes 12 months after the disaster.

New body camera footage has shown the evacuation efforts following the East Palestine toxic train derailment.

An NTSB hearing has revealed that an engineer had concerns about the train’s size before its derailment. ABC News’ Andrea Fujii explains.

The National Transportation Safety Board will start taking sworn testimony Thursday as part of its probe into the toxic train derailment in East Palestine, Ohio.

Pennsylvania's Blackhawk School District sued Norfolk Southern over the East Palestine train derailment, alleging negligence.

Since the East Palestine derailment, legislators and railroad leaders have emphasized the need for more hazmat training among local emergency responders

The company told the U.S. Senate it will establish a fund for homes within a five-mile radius of the February derailment in East Palestine to pay for declines in property values after the spill.

Members of a CDC team are experiencing symptoms after investigating the East Palestine train derailment, raising new questions about air quality.

The CDC said multiple investigators in East Palestine, Ohio, fell ill while studying possible health impacts from the train derailment last month.

Members of a CDC investigative team studying the health effects of the Ohio train derailment briefly became ill with symptoms including headache and nausea.

The lawsuit is seeking relief and monetary penalties for each day it violated clean water laws in East Palestine, Ohio.

The DOJ is seeking fines for alleged violations of the Clean Water Act from Norfolk Southern in the East Palestine, Ohio derailment.

East Palestine, Ohio, resident Misti Allison testified to the U.S. Senate Committee on Commerce, Science and Transportation about the toxic train derailment

Sen. Bob Casey’s bill, set to be introduced Thursday, would create a new fund which would be used to reimburse emergency responders

Eight freight rail cars carrying corn syrup derailed near Topock, Arizona on Wednesday evening, according to BNSF Railway, not hazardous materials.

Ohio Attorney General Dave Yost said the state filed a lawsuit Tuesday against Norfolk Southern over last month's toxic train derailment in East Palestine.

Ohio Attorney General Dave Yost said the state filed a lawsuit Tuesday against Norfolk Southern over last month's toxic train derailment in East Palestine.

The head of the National Transportation Safety Board criticized embattled train operator Norfolk Southern's new safety goals amid a series of train derailments in recent weeks.

ABC News’ Martha Raddatz interviews National Transportation Safety Board Chair Jennifer Homendy on “This Week.”

The Association of American Railroads said defective wheels were involved in the Norfolk Southern train crash in Springfield, Ohio, on Sunday.

Shaw declined to directly answer what Norfolk Southern would specifically do for affected families in Thursday's congressional testimony.

A series of rail cars that Norfolk Southern recently put into service have been discovered to have defective, loose wheels.

Norfolk Southern CEO Alan Smith is slated to testify Thursday before a Senate Committee in Washington in the wake of the toxic train derailment in East Palestine, Ohio.

Alan Shaw testified before lawmakers on Capitol Hill and told East Palestine, Ohio residents he was deeply sorry for the derailment.

ABC News’ Jay O’Brien reports on Capitol Hill testimony from Norfolk Southern’s CEO following multiple train derailments and provides updates on Sen. Mitch McConnell's health.

CEO Alan Shaw apologized to residents of East Palestine, Ohio, and promised to "make this right."

ABC News’ Jay O’Brien and Gio Benitez report on Norfolk Southern CEO's Capitol Hill testimony and former NTSB chief Jim Hall breaks down why the nation’s rail system is facing problems.

Norfolk Southern Railway CEO Alan Shaw testifies before Congress on recent rail derailments.

The investigation comes as the CEO testifies before Congress about other derailments in February.

As Norfolk Southern CEO Alan Shaw is set to testify before Congress, officials are looking into the company’s handling of a separate incident on Feb. 27.

Federal regulators are looking into Norfolk Southern's handling of an additional reported hazmat concern, just weeks after the derailment in East Palestine, Ohio.

U.S. safety investigators released a preliminary report into the derailment of a Norfolk Southern train carrying toxic chemicals in East Palestine, Ohio.

NTSB investigators are on the ground of another Norfolk Southern derailment in Ohio that took place over the weekend.

Four of the 28 cars of a Norfolk Southern train that derailed Saturday near Springfield, Ohio, were empty at the time of the accident, according to officials.

ABC News’ Alex Presha reports from Springfield, Ohio, after a Norfolk Southern train derailed there. It marks the second time one of the freight carrier’s trains has derailed in the state in a month.

Ohio Sen. Sherrod Brown speaks with "GMA3" after another Norfolk Southern train derails in Ohio one month after the first derailment caused a toxic chemical spill in East Palestine.

Officials from Ohio and Norfolk Southern deliver remarks on another train derailment, the second such incident in just over a month.

This comes after Norfolk Southern has announced it is removing 2,000 feet of tracks in East Palestine, Ohio, to remove contaminated soil from the February derailment.