A U.S. federal investigation into last year's deadly train derailment in Philadelphia has concluded that the engineer was distracted, according to officials close to the investigation.
Officials say train engineer Brandon Bostian was distracted by radio conversations between trains and dispatchers about trains being hit by rocks, prior to the May 2015 crash that killed eight people and injured more than 200 others.
The National Transportation Safety Board (NTSB) is expected to announce its findings at a public meeting Tuesday in Washington.
Bostian, who suffered a concussion in the crash, told investigators he has little memory of what occurred prior to the accident. Investigators say they found no evidence the engineer was using a cellphone, or alcohol or drugs.
The Amtrak passenger train was traveling from Washington to New York when it derailed along a curve of track in Philadelphia while traveling at more than 160 kilometers per hour, more than twice the speed limit.