The death toll from a Friday collision between a truck and an Amtrak train in Nevada has risen to at least six. Officials found the bodies of the truck driver and one of the train crew late Saturday. Twenty-eight people still remain unaccounted for, though the National Transportation Safety Board said some of the 210 with tickets might have gotten off the train before the crash. Emergency workers spent Saturday searching for bodies among the wreckage of the California-bound train, though the severe damage hampered their efforts to confirm a death toll. Investigators said visibility was excellent the day of the crash, and they said they are baffled why the head driver didn't stop upon seeing the train approaching. The engineer, who survived the crash, also tried to bring the train to a halt. The truck dragged half a mile down the tracks before a fire broke out in two of the passenger cars.