The National Transportation Safety Board says they believe a broken rail tie caused a deadly train derailment on I-25 North of Pueblo last Sunday. Officials say the broken rail preceded the derailment and then the bridge collapsed. Thirty cars fell from the overpass onto the interstate, crushing a semi-truck and spilling coal across the highway. Officials say the semi driver—60-year-old LaFollette Henderson of Compton, California— was killed when the train cars fell on his 18-wheeler. According to state patrol, cleanup time is expected to be considerable.