https://www.cnet.com/news/hyperloop-speed-records-broken-down/ > Five years into the great hyperloop experiment, there's still more hype than hyper-speed.   > Elon Musk open-sourced his white paper for a near supersonic train-in-a-tube concept back in August 2013. Since then, a handful of companies, including Musk's own SpaceX and Tesla, have been working to build the hardware that could one day slingshot us from city to city around 20 percent faster than the top speed of most commercial airliners.