Overhead derailment ties up traffic on Highway 360 Union Pacific blames human error; no injuries reported 12/18/2002 By JASON TRAHAN / The Dallas Morning News ARLINGTON - A Union Pacific locomotive veered into two railcars traveling on parallel tracks Tuesday, triggering a derailment that left one of the railcars hanging precariously over a busy freeway and tying up traffic for miles, officials said. About 10:45 a.m., a railroad worker switched a westbound locomotive onto a parallel track occupied by a westbound train laden with automobiles, said John Bromley, a UP spokesman in Nebraska. The locomotive collided with the parallel...