Here is a link to an interesting logo on an ethanol tanker photographed on Jan 6, 2013 in a train passing through Little Rock, AR. Reporting mark SHQX belongs to American Railcar Industries.
http://thundertrain.org/010613USshaqx7321TargrayColor-28R.jpg
http://thundertrain.org/010613USshaqx7321TargrayColor-28R.jpg