Latest: Feds looking at whether Amtrak engineer was distracted by trainee, official says

Investigators are looking into whether the Amtrak engineer whose speeding train plunged off an overpass, killing at least three people, was distracted by the presence of an employee-in-training next to him in the locomotive, a federal official says.
The official, who was not authorised to discuss the matter publicly and spoke on condition of anonymity, said investigators want to know whether the engineer lost "situational awareness" because of the second person in the cab.