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What if the entire loop was in motion? Picture a maglev train 1200km long. There is no "front" to the train, it's a loop, so air is not being compressed as it whizzes along at 1200kmph. Most of the space inside the train could be void, which could be filled with passenger cars as needed.

Would that eliminate enough of the air resistance to be feasible? Is a 1200km long contiguous structure feasible?

I am fairly sure it would not help. If you're rubbing past air at that speed, you'll have pretty serious friction issues.

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