Transportation Infrastructure Stressed by Heat

UNDATED - Humans, animals, crops - all have suffered in the recent heat wave. And so has the transportation infrastructure in the Midwest. Omaha-based Union Pacific Railroad says the heat has forced it to slow trains in heat-affected areas by 10 to 20 miles per hour. Company spokesman Mark Davis says extreme heat can cause metal rails to expand and kink at weak spots. Extreme heat can also cause blow-ups on roads and highways. Dale Butler, Nebraska Dept. of Roads District Operations and Maintenance Manager, says blow-ups haven't been a big problem yet in the eastern part of the state.