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<p>Lets suppose that the promoters of the Texas 'high speed' rail link between Dallas and Houston scare up enough investors to make the project possible.  Lets further suppose that they decided that they must run along existing track, with perhaps some straightening of the right-of-way and, furthermore, they cannot afford to electrify the line.</p> <p>What is the top speed that they could hope for on first class track and roadbed, with a power car on both ends of the train, so that it would not have to be turned at the end points, pulling six cars?  Keeping in mind that I am not an engineer, would it be diesel or gas turbine or could it be either?</p>
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