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do you want a quick rule of thumb, or something specific to certain classes of locomotives? the quick rule of thumb is that tractive effort will never excede 25% of the weight on the drive wheels. In reality it'll probably be much less, particularly at low speeds. to get more in depth, you'll have to know piston area, steam-chest pressure, stroke, etc,etc,etc. . . there are formulae out on the web. you're probably best off checking one of the railway guides or doing a search for your particular locomotive on the web and see what the manufacturer claims.
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