This photograph taken east of the Mulford Road grade crossing in <a href="https://en.wikipedia.org/wiki/Cherry_Valley,_Illinois" class="extiw" title="en:Cherry Valley, Illinois">Cherry Valley, Illinois</a> shows some of the piled up <a href="https://en.wikipedia.org/wiki/DOT-111_tank_cars" class="extiw" title="en:DOT-111 tank cars">DOT-111 tank cars</a> in this accident.  Thirteen of the tank cars lost about 324,000 gallons of ethanol due to head and shell breaches, damaged top fittings, or damaged bottom outlet valves.  
This represents a release of about 75 percent of the product carried in the 15 derailed tank cars in the pileup. This photograph also demonstrates a consequence of this accident in which several of the tank cars came to rest in and near a tributary of the <a href="https://en.wikipedia.org/wiki/Rock_River" class="extiw" title="en:Rock River">Rock River</a> and released a significant volume of product that resulted in one of the largest <a href="https://en.wikipedia.org/wiki/fish_kill" class="extiw" title="en:fish kill">fish kills</a> in Illinois history.
NTSB
On or about June 19, 2009
Taken from a 02/17/2012 presentation by Paul L. Stancil of the NTSB Office of Railroad, Pipeline and Hazardous Materials Safety.