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 t

 

              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 t
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)