Musk also tweeted that a first set of tunnels would be to alleviate greater LA (Los Angeles) urban congestion.
SAN FRANCISCO/WASHINGTON: Tech entrepreneur Elon Musk on Thursday said he had received "verbal" approval to start building an ultra-high-speed underground transport system linking New York and Washington that would cut travel time between the cities to about half an hour.
He offered no details on what entity had greenlighted the project that could result in the world's longest tunnel.
