Trans Environmental Systems, Inc., TESI, now offers open track containment pans for those corporations that load or unload railroad cars.  These heavy-duty track pans just lagbolt down to the existing track ties and actually retain about 200 gallons of liquid.  This product line is targeted for use under canopy roof transloading racks or for individuals who choose to disregard the cost of processing tainted rainwater or shoveling snow and debris out after every storm.  TESI website is www.transenvsys.com