I've lost my bank card genie-rx.com Most of the existing DOT-111 fleet was built to carry ethanol, refined fuels or petroleum liquids, all of which tend to be more flammable than crude. Of an estimated 290,000 tank cars in service over a year ago, 69 percent of them were DOT-111s, according to the NTSB's March 2012 letter. Until recently, only a handful of those would have carried crude.