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An entire submarine displaces (has a mass of) 6,000 tons. Not the reactor, which is a small fraction of that.
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A nuclear sub avoids carrying large amounts of coolant by using sea water as part of it's coolant system. A nuclear powered train would not be able to do this, and would require an extensive cooling system that would add alot of weight.
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It's a function of tractive effort as determined by the "factor of adhesion" and the "ruling grade." The newer locomotives with electronic wheel slip technology has allowed locomotives to substantially increase their tractive effort and ability to start up a grade.
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A train's ability to climb a grade is limited by wheel slip, not horsepower. Locomotives can typically achieve a tractive effort equal to 1/3 of their weight.
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I understand that the heavier the engine, the more traction is experienced; however, I was just pointing out the amount of power required to do the work in that amount of time. Sure you could experience less wheel slip with an extremely heavy train, but you would climb very slowly.
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