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"A train derailment and fatal chemical spill on Jan. 18, 2002, in Minot, N.D., exposed the vulnerability of our nation's transportation of common but hazardous agricultural chemical," the Forum reports. The story depict the disaster -- known as the largest spill of anhydrous ammonia, a farm fertilizer -- in the world but also investigates its causes. The main findings are that pre-1989 railroad tanker cars are susceptible to puncturing in accidents in cold weather; tracks often contain a number of defects; and rescue workers and hospitals are ill-prepared for disasters.