Dozens of reports and interviews from the National Transportation Safety Board’s ongoing federal investigation into last year’s BNSF coal train derailment north of Pueblo have now been released published online.

Investigators had previously identified broken rail California truck driver Lafollette Henderson was killed on the tracks near where six coal cars crashed onto Interstate 25 and a bridge over the highway partially collapsed.

Hundreds of pages of recently released documents contain the results of tests and inspections, as well as interviews with railway employees.

The train was traveling from Denver to La Junta at 32 miles per hour when the accident occurred. This is below the maximum allowed speed. According to the train crew, conditions and equipment appeared normal before the accident.

“As they began to approach the bridge,” the report said, “they sensed a rough road and felt it was causing ‘really bad shaking left and right.”

The locomotive engineer slowed the train down using the air brakes and then stopped the train using the emergency system.

The report said that the engineer “stated that he was not aware that the train had derailed at that moment due to the dust clouds hiding the cars in his mirror.” “When the dust cleared, the engineer stated that he could see some cars ‘overturning to the right’ and spilling their coal. He then stated that the first four cars behind the two locomotives were standing upright.

He radioed an emergency alert and called 9-1-1.

Sarah Taylor Sulick, spokeswoman for the National Transportation Safety Board, said it was common for documents collected over the course of nearly a year to be released as part of the investigation.

“None of the reports on file will include analysis, probable cause, or our recommendations on how to prevent similar events from occurring,” he said. “This will come later in the final report, which could take 12-24 months to complete.”