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There are a lot of variebles involved here, How much do the cars weigh, are they all NMRA recommended weight, How freely do the trucks roll, Is some of the 2 percent grade on curves, and what radii are the curves involved, I haven"t had occasion to pull 100 cars up a 2 percent grade, but based on my experience of running hundreds of somewhat shorter Trains with Kato power, useing the Kato SD-90/43 Mac as the motive power of choice, I would think that you would need at least four units to avoid excessive wheelslip, and a possible stall, again depending on all of the variebles involved, Someone else who has done this lately may give you more insight as to the number of units it would actually require to do this than I, Keep us posted on your results, after you have actually pulled the Train, I would be interested to know how many locomotives you had to use, cheers. Mac
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