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The US Interstate System measures roughly around 47,000 miles in length connecting most urban areas.

What if the finance was made available from Congress, and a tunnel system was built (twin bore) carrying a Maglev rail line matching the Interstate systems route. This would also be vaccumed to increase the speed of the trains.

I'm thinking of a build period of around 50 years.

Would this be possible in the time frame?
How much would it cost?
Would their be enough manpower to go through with the project?
How good would it compete with the airline system?

Regards filers
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