About 6:06 p.m., on November 9, 1977, 2 SD-45 locomotive units and 35 cars of Louisville Nashville freight train No. 407 derailed when entering a 6°04' curve at Pensacola, Florida. The adjacent tank heads of the 18th and 19th cars were punctured during the derailment by a loose wheel and axle assembly; this released anhydrous ammonia into the atmosphere. Two persons died and 46 were injured as a result of the derailment, release of anhydrous ammonia, and evacuation of about 1,000 persons. Property damage was estimated to be $724,000.