What was the name of Elon Musk's 2013 proposal for a high-speed transport system?

Elon Musk's 2013 proposal for a high-speed transport system was called Hyperloop Alpha.

Musk published the concept in a document titled “Hyperloop Alpha” in August 2013. It described passenger and cargo capsules traveling through a low-pressure tube, using reduced air resistance and magnetic or related propulsion concepts to enable very high speeds.

Musk did not create a fully operational Hyperloop system himself. Instead, he released the idea publicly and invited others to develop it. Several companies and research groups later pursued different versions of the concept, including vacuum-tube transport projects and student competitions.

Hyperloop is sometimes confused with conventional high-speed rail or maglev trains. Its defining proposal is the combination of a tube, reduced pressure, and fast-moving pods rather than trains running in open air.