Elon Musk is stealing the MagLev’s thunder today, sending out a viral series of tweets about a proposed underground East Coast “Hyperloop” train that would run through Baltimore.

The 46-year-old tech entrepreneur behind Tesla, SpaceX and SolarCity, among other firms, tweeted this morning that he’s received “verbal govt approval” to build a 220-mile underground rail line stretching from New York City to Washington D.C. Each stop, he said, would have “up to a dozen or more” elevators to enter and exit the station, and go from city center to city center.

The Boring Company, a tunnel-boring firm that Musk started half-jokingly while sitting in traffic this past winter, would carve out routes running beneath the surface of major city blocks and hundreds of miles down the East Coast. A hyperspeed rail line would then be installed, with “pods” moving through a vacuum-like tube utilizing magnetic levitation, according to the Hyperloop One project website.

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