H-1 update 1

The hyperloop idea has roots in the past, but Elon Musk made it exciting in 2012. He publicized his vision and promoted public competitions for prototype designs.

A hyperloop system's obvious advantage is its speed. It is ground transport that moves potentially at air speed, maybe as fast as 600+ mph. 

Several startups formed to pursue making hyperloop a reality. One of them took the lead in getting investment funds and making progress: Virgin Hyperloop One.

Here is a good summary of where the concept stands now:

(cont'd tomorrow)