Issue 7 and Volume 144.

PHOSPHORUS INCIDENT IN COOPER COUNTRY MISSOURI Written from contributions by Bill Simmons, chief of Cooper County Fire Protection District; John B. Sachen, chief of fire protection and chemical response for Mallinckrodt Specialty Chemicals Company, St. Louis, Missouri; Leo Tierney, director of hazardous-materials management for Union Pacific Railroad, Omaha, Nebraska; and the office of John Coburn, state fire marshal of Missouri. The Union Pacific Railroad line between Kansas City and St. Louis, Missouri, is 250 miles of well-traveled track, much of it winding through rural countryside. Almost midpoint between the two cities lies Cooper County, a farming region just west of Columbia. Missouri. At approximately 10:50 a m. on Wednesday, February 20, 1991, as a 1 1 3-car, 6,500-foot-long freight train approached the eastern end of the county, a wheel broke on one of the cars, causing a 29-car derailment. Four of the derailed cars each contained 185,000 pounds of solidified…

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