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Most (over 95%) of the global ET3 network will operate at 200mph to 600mph speed, and be above ground for much less cost. Underground ET3 is at least 3 times the expense of elevated structure. At higher speed than about 600mph, most ET3 will be underground to achieve the straightness required for passenger comfort. Higher speed ET3 must be actively aligned to automatically compensate for normal earth movements, for these reasons the cost will be much greater, (but the capacity will also increase by approximately the same factor).