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On September 22, 1993, about 2 45 a m, barges that weie being pushed by the towboat MAUVILLA in dense fog struck and displaced the Big Bayou Canol railroad bridge near Mobile, Alabama About 2 53 a m., National Railroad Passenger Corpoiation (Amtrak) train 2, the Sunset Limited, en route from Tos Angeles, California, to Miami, Florida, with 220 persons on board, struck the displaced bridge and derailed The three locomotive units, the baggage and dormitory cars, and two of the six passenger cars fell into the water The fuel tanks on the locomotive units ruptured, and the locomotive units and the baggage and dormitory cars caught fire. Forty-two passengers and 5 crewmembers were killed, 103 passengers were injured The towboat's four crewmembers were not injured

The National Transportation Safety Boaed determines that the probable causes of Amtrak train 2's derailment were the displacement of the Big Bayou Canot railroad bridge when it was struck by the MAUVILLA and tow as a result of the MAUVILLA's pilot becoming lost and disoriented in the dense fog because of (1) the pilot's lack of radio navigation competency, (2) Warrior & Gulf Navigation Company's failure to ensure that its pilot was competent to use radio to navigate his tow during periods of reduced visibility, and (3) the US Coast Guard's failure to establish higher standards for inland towing vessel operator licensing. Contributing to the accident was the lack of a national risk assessment program to determine bridge vulnerability to marine vessel collision.

Safety issues discussed in the accident report include towboat operator training and evaluation, bridge risk assessment, bridge identification, emergency response and evacuation procedures, and event recorder crashworthiness.

The Safety Board makes recommendations addressing these issues to the U.S. Department of Transportation; the U.S. Army Corps of Engineers, the U.S. Coast Guard, Amtrak, the Federal Emergency Management Agency, The American Waterways Operators Inc, the Warrior & Gulf Navigation Company, the Association of American Railroads, and the American Short Line Railroad Association.