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CSSHEGEWISCH - No matter how you calculate the Garratt's tractive effort (and with empty tanks and fuel bunkers, you're figuring on some percentage of what the engine weighs on drivers, and unless that percentage is ridiculously low . . .) it will diminish as the consumables are used. It is true that it will be greater than that calculated when you have full fuel bunkers and water tanks. But what tractive effort is available, no matter how it's calculated, is going to be less and less the farther up the mountain you get. If you consider a long mountain like UP's Wahsatch or some other western biggies, you'd have to set the tonnage rating for a Garratt not much more than what it would be with empty tanks and coal bunkers to make sure you had enough tractive effort to get you all the way to the top. But Big Boy's tender (and thus his trailing load) actually got lighter the closer to the top he got. Not much, considered as a percentage of his total train tonnage, but some. But the Garratt will lose weight where it will hurt him. Old Timer
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