The Bureau of Explosives is now the Hazardous Materials Systems. This change indicates that a part of the Association of American Railroads is responsible for coordinating the railroad policy for the transportation of all hazardous materials, not just explosives. The Bureau assists the railroads in responding to incidents involving hazardous materials, maintains a field force of 18 inspectors to assist the railraods and chemical companies in complying with federal regulations, and publishes various documents concerning transportation of hazardous materials and emergency response. The Bureau has a laboratory that can assign the appropriate classifications to chemicals including explosives.