Each day, more than 800,000 shipments of hazardous materials crisscross the United States via highways, railways and pipelines. Railcars transport only a fraction of these shipments, yet create a disproportionate amount of risk to both the chemical and rail industries — and to average citizens in general. By virtue of the amount of chemicals each car carries, railroad tankers are a slow-moving bull's-eye for potential saboteurs. STRATFOR has addressed the vulnerability of large stores of commercial chemicals — found throughout the United States — to a potential terrorist attack. Of particular concern is chlorine, because of its lethality and its widespread availability. U.S. Department of Transportation and Department of Homeland Security authorities have worked together with chemical and railroad industry officials to ensure that railyards are secure. Many, however, still harbor doubts about the security of the railcars that transport these chemicals.