R.R. tracks were the first thing to come to mind for me. My old Pete 372, if I did my part and with a moderate load/relatively flat route, I could manage 9 fairly well. That was without much in the way of intentional technique or anything.
Heck, I've seen a couple from time to time for sale, though I sold mine due to parts availability issues, I'm still tempted to grab one, fix it up some, and use it for local intermodal runs or the like.
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