train length
I think your layout is great, and I think you should post some pics and a track plan. The locals you run, are probably the perfect size. I think your next move would be weathering the rolling stock, and taking some of the rolling stock off the layout until it is needed. Remember that on our line, we can pass an industry or siding that is empty for days. (Kent). Not all business on line have a non stop loads in - empty out traffic flow. Also, since your trackwork is reliable, try shoving some locals caboose first like the goodman locals, rather than trailing point only moves for variety. Do you have any csx/chessie cabooses, I can't remember.
But it was cool seeing the big coal trains too.
DJ