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The gross tractive effort of a locomotive is driven by the friction between the wheels and track, and the weight of the locomotive. Better wheels are smoother, and give less traction. Too many locomotives are too light to pull much. If you build it, and you can't quite make the grade, you can investigate adding weight to the locomotives. Lead is easier to use, but Tungsten is heavier and costs more. Build it, test it, modify the equipment, do it again. Good luck! Mark in Utah Proud owner of two AC4400's with 12 ounces of additional weight each. They'll pull anything.
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