A National Transportation Safety Board hearing examining a collision at a train crossing in the Nevada desert in June 2011 concluded on Tuesday the accident between an Amtrak passenger train and a tractor-trailer could have been prevented if the truck driver had stopped in a timely manner and if the brakes on his rig worked properly.A third cause addressed by the safety board said the shortcoming in the passenger rail car side strength led to five deaths on the train. The NTSB conducted a hearing in Washington, D.C. to determine the cause of the accident and to make recommendations.At about …