Doc.
Before stokers were common they used a mine run coal that was sized from about 4 inches all the way down in size to dust. When stokers were in mass they enlarged to six inch chunks to dust in size. Coal size was not consistent and the RR bought what ever was the cheapest that still burned. Consistent size spillage would not look right. Variety is key.
Pete
I pray every day I break even, Cause I can really use the money!
I started with nothing and still have most of it left!