When Elon Musk’s highly anticipated Tesla Diner opened its doors in Los Angeles on July 21, it garnered significant media attention, with customers lining up for hours to try chef Eric Greenspan’s pie shakes and classic burgers served in Cybertruck-shaped boxes. This past weekend, however, the lines looked a little different.

Elon Musk has worked in outer space, but now he's got a plan for underground, high-speed transportation from the airport to downtown in Nashville