A New York to Washington hyperloop trip in 29 minutes is what Elon Musksays he has on the table.

The Tesla and SpaceX founder tweeted this morning he’d received a verbal okay to dig a tunnel beneath the East Coast that would link the center cities of New York, Philadelphia, Baltimore and D.C. An Amtrak for the 21st century.

The hyperloop is an idea Musk publicly discussed in 2013. It’s an idea for how to achieve super efficient transportation and its principles are that you create an environment with as little friction as possible: A train placed inside a tube where all the air molecules have been pumped out so there’s nothing to bang against it and slow it down.

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