The widow of a Union Pacific Railroad engineer who died in a train collision last October filed a wrongful death lawsuit against the company after an apparent mechanical brake malfunction. On the day of the incident, engineer Jason Martinez's train was heading east to North Platte, Nebraska, when the train's crew realized the brakes were malfunctioning. The crew alerted Union Pacific Railroad dispatch center and informed them that the train had accelerated to 50 mph and was unable to stop. The train ultimately collided with another train that was stopped on the tracks about 18 miles west of Cheyenne, Wyoming. No one was in the stopped train at the time of collision.