Musk with the Tesla Model S in Fremont on Oct. 1, 2011. Stephen Lam/Reuters/Landov hide caption

itoggle caption Stephen Lam/Reuters/Landov

A rendering of a Hyperloop pod. Courtesy of Elon Musk hide caption

itoggle caption Courtesy of Elon Musk

Elon Musk's "Hyperloop" vehicle. Elon Musk hide caption

itoggle caption Elon Musk