In either case you are probably expending way more energy digging and mining the coal such that the hauling is negligible.
Moving away from coal would have a much greater positive environmental impact than engineering the hell out of the hauling efficiency. Like wind power, solar power, hydro power, for instance, all of which don't need any hauling once built.
Moving away from coal would have a much greater positive environmental impact than engineering the hell out of the hauling efficiency. Like wind power, solar power, hydro power, for instance, all of which don't need any hauling once built.