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You are wrong. If you have two locomotives that weigh the same, have the same number of drivers, but one has 4000 HP and the other 2000 HP, they will both be able to start and pull identical trains. That is a result of Tractive Effort! <br /> <br />Now when you reach the balancing speed for 2000 HP the lower horspower locomotive will stop acclerating its train. But the 4000 HP locomotive will be able to continue to accelerate. That is HORSEPOWER not Tractive Effort. <br /> <br />If the locomotive are identical in weight and drivers the Tractive Effort is identical and at identical speeds they can pull identical trains. Only when you want to go faster or accelerate faster does the horsepower do anything for you.
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