Wikipedia:Coke Express

Coke Express trains are unit trains operated by CSX Transportation. They carry coke for steelmaking, power generation and other various uses. These cars consist of a mixture of standard and high-topped open-top hopper cars, most of which are owned by CSX. Many of the high-capacity hoppers built for CSX are painted with large letters that read "COKE EXPRESS", hence the nickname given to CSX coke trains.