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If they are gonna build a high speed train across America. It would have to be elevated so that it won't cross anything else, like a road for example. Other reason why it would have to be elevated is cause of weather. If it snows, no problem cause the train would run above the snow. Also by being elevated they can keep the track flat. Just build it with different heights as land is so that the track will be flat as much as possible.
As for those that might say "wouldn't there be snow on the track itself?," then the track can turn on heat to melt the snow as needed.
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