This June 20, 2009 photo provided by the National Transportation Safety Board shows the aftermath of a train derailment near Rockford, Ill. The most common cause of ethanol release in this accident ... more 
This June 20, 2009 photo provided by the National Transportation Safety Board shows the aftermath of a train derailment near Rockford, Ill. The most common cause of ethanol release in this accident was tank head failure on the tanker seen at right, known as a DOT-111, due to impacts received from couplers and draft sills of adjacent tank cars. For two decades, rail tankers designated as DOT-111, a workhorse of the American rail fleet, have been allowed to haul hazardous liquids from coast to coast even though transportation officials were aware of a dangerous design flaw that almost guarantees the car will tear open in an accident. (AP Photo/National Transportation Safety Board) less 
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Associated Press | Photo By National Transportation Safety Board
Wed, Sep 12, 2012 3:22 AM EDT