The beleaguered transit system in the Northeast may receive a boost from one of the most ambitious entrepreneurs in the world.

Elon Musk tweeted Thursday that The Boring Co. received “verbal” government approval to begin building an underground Hyperloop, saying it would take 29 minutes to go from New York to Washington, D.C.

“Just received verbal govt approval for The Boring Company to build an underground NY-Phil-Balt-DC Hyperloop,” Musk said.

@elonmusk tweet.

The proposed Hyperloop would connect the city centers of New York, Philadelphia, Baltimore and D.C., as Musk tweeted in a follow-up.

@elonmusk tweet.

Musk did not say whether this verbal approval comes from the individual cities themselves or from a federal authority.

An Amtrak ride on the Northeast Regional line from D.C. to New York currently takes three hours and 20 minutes, according to the passenger railroad company’s website.

At the International Space Station Research & Development Conference in D.C. on Wednesday, Musk said another one of his plans, to dig tunnels under Los Angeles, is a “low stress activity” because “everyone expects it to fail.” Musk has said previously he has had “promising conversations” with Los Angeles Mayor Eric Garcetti about moving forward with the project, but has yet to receive a permit from the city.

Musk plans to start digging the New York to D.C. route at the same time as the Los Angeles urban congestion project. Asked whether Texas might receive a Hyperloop system, Musk tweeted “for sure” before enumerating on his plans.

@elonmusk tweet.

A Los Angeles to San Francisco route would add a third proposed Hyperloop project, as Musk continues to plot connections between major U.S. cities.

Mayor’s offices in New York, Washington, Philadelphia and Baltimore were not immediately available for comment.

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