That reminds me of how I first got my HO scale "coal" for loads. I didn't have any HO "coal" and was sort of looking for some. You might find this interesting:
Back in the mid-1980's I was a sales rep for the Burlington Northern RR in Portland OR. One day I had to go to the BN's Portland Yard on business, and while there I noticed a small pile (about 3' diameter) of some black stuff in the middle of a track - obviously leaked out from a hopper. I went over and looked - the pieces were shaped like lumps of coal, only varying in rough diameter from 1/32 to 1/4 inch. I think someone told me later that it was copper slag. Well, I came back and shoveled some of it in a couple boxes and went home and strained it. This made perfect size and shape coal loads (glued to load-shaped styrofoam), and I still have some of that in a bag today.
K487
Back in the mid-1980's I was a sales rep for the Burlington Northern RR in Portland OR. One day I had to go to the BN's Portland Yard on business, and while there I noticed a small pile (about 3' diameter) of some black stuff in the middle of a track - obviously leaked out from a hopper. I went over and looked - the pieces were shaped like lumps of coal, only varying in rough diameter from 1/32 to 1/4 inch. I think someone told me later that it was copper slag. Well, I came back and shoveled some of it in a couple boxes and went home and strained it. This made perfect size and shape coal loads (glued to load-shaped styrofoam), and I still have some of that in a bag today.
K487