The National Transportation Safety Board is blaming crew fatigue for a 2014 train crash that killed two Union Pacific workers in Arkansas. They also cited an automatic horn that improperly reset alarms and the railroad industry's slow adoption of a system to stop trains automatically.
Investigators told the board Tuesday that the train's conductor had been working an irregular schedule while the engineer suffered from moderate sleep apnea. The railroad requires only that severe cases be disclosed.
The NTSB said an automatic horn incorrectly reset alarms designed to ensure crew members remained alert.
The board's vice chairman voted against the findings, saying the panel should have given more weight to the lack of GPS-based technology to monitor and control train movement.
Union Pacific said Tuesday that it cooperated fully with the board's investigation and that safety is its top priority. It also said it looked forward to examining the board's recommendations.