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I would need to see a graph that compares a diesel and conventional steam locomotive of the same maximum horsepower rating, pulling the same train on the same level and straight track.  Each locomotive would accelerate the train to the balance speed (max. speed at full throttle). During the acceleration, the horsepower and tractive effort produced would be recorded along with the rate of acceleration.  Maybe the comparison would be conducted several times with a heavier or lighter train to yield a range of balance speeds, but in each case, the comparison would be apples-to-apples. This is the result I would expect to see: 1)      Both locomotives would be producing their maximum horsepower at their maximum speed.  2)      The maximum speed for both locomotives would be the same.  3)      The diesel would accelerate the train to its maximum speed in less time than the steamer.
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