The idea of an 800 mph transportation system is just the latest idea from the mind of Elon Musk.

Musk is a 42-year-old engineer who co-founded PayPal and created Space Exploration Technologies (SpaceX), a private space exploration company, and Tesla Motors, an American electric car company that produces the acclaimed Tesla S model.

Musk is also chairman of SolarCity, a company he cofounded "to help combat global warming and minimize air pollution," according to his website.

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Aerial photograph shows construction of Centennial Yards in downtown Atlanta on Thursday, Dec. 4, 2025. (Hyosub Shin/AJC)

Credit: HYOSUB SHIN / AJC

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A MARTA operator is seen inside the control room of one of the new MARTA trains during the unveiling of these trains on Thursday, Jan. 30, 2025. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez