On March 12, the National Transportation Safety Board issued its first comprehensive safety report into the train crash.
The NTSB concluded that the derailment was a combination of “unsafe train movements” and “unanticipated delays” at the time of the accident.
The train was traveling at a speed of up to 55 mph when it derailed in an area of low visibility, according to the NTSB, and was traveling between Chicago and Washington, D.C. when it collided with a freight train.
According to the report, the train was travelling at a “very low” speed, “at least” 25 mph when the train crashed, and “was traveling between a low and moderate speed.”
The train had been carrying about 1,400 passengers, including passengers from a small Illinois town, the report stated.
The accident was caused by a mechanical failure on the Amtrak Train #2 locomotive at the Coney Island tracks, the NTSBs report said.
The company is cooperating fully with the NTSSB investigation, Amtrak spokesperson Jody Lipschutz said.
“This is a tragic accident that happened as we continue to recover from the impact of the crash, and we are cooperating fully and fully with federal and state authorities,” Lipsichutz said in a statement to Business Insider.
The investigation into the crash has focused on the speed of the train.
In the NTSb report, it noted that the train’s speed at the scene of the derailments was “likely” above 55 mph, but said that the NTSBS could not prove that the speed was unsafe.
The locomotive is considered the “safest in Amtrak’s fleet” by the Federal Railroad Administration, and has been used in more than 400 accidents since it was introduced in 2008, according the NTSbs report.
But the NTSBI did not include the speed at which the train came to a stop on the tracks.
It was not immediately clear whether the speed limit on the C-Train was 55 mph or above, and the NTSBB did not explain why the train did not exceed that speed.
The Federal Railroad Administrator did not immediately return Business Insider’s request for comment on the NTSbis report.
On the surface, the derailages were not a major safety issue.
In August 2017, Amtrak reported that it had received 5,400 complaints of train derailments, and said it was making improvements to train operations.
In 2016, the Federal Transit Administration recommended that the railroad provide train operators with speed monitoring equipment, but the NTSBoard said the train had not received the equipment.
In April 2018, the federal government also fined Amtrak $3 million for failing to provide a warning system to track workers.
The U.S. Department of Transportation also has proposed a plan to fund an additional $4 million to improve train maintenance, including track maintenance.