Gidday Jack, a belated reply, and as no one has come up with a source of commercial coke loads , here’s a couple of links to making coal loads, similar principles should work for coke.
http://cs.trains.com/mrr/f/11/t/215446.aspx
http://cs.trains.com/mrr/f/11/t/197792.aspx
Cheers, the Bear