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High-speed rail in the USA?

Its clear that the

The U.S. is years behind Europe and Asia when it comes to high-speed rail. How far behind are we technically what plans are there for high-speed rail and is it really a greener form of transport than air or road?

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High-speed rail

Its clear that the U.S. is years behind Europe and Asia when it comes to high-speed rail. How far behind are we technically what plans are there for high-speed rail and is it really a greener form of transport than air or road?