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a modern aircraft carrier displaces over 200,000 tons, when moving at top speed of around fifty knots, they take about twenty miles to stop! and that's give'n her everyth'n sh's got cap'n! To achieve this speed an expenditure of more than 160,000 horsepower is needed. Freight ships are economicle because of their size, the speed they travel - 12 knots, the distances they travel uninterupted, and the fuel that they burn is basically tar. This train may not be as big, but with such scale there is a loss of flexibility. <br /> <br />The standard guage actually goes back to the roman times, it is the average width of two horse's asses.
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