Branson attended and said he saw "firsthand the exciting technology being tested".
Hyperloop trains work by loading passengers and cargo on to a pod which is accelerated to speeds of nearly 700mph inside a sealed low-pressure tube using electric propulsion.
Trains: Hyperloop floats above the surface of the tube.
"Virgin Hyperloop One are leading the way in these efforts", he continued, noting that the company is "working on exciting projects in the Middle East, Europe, India, Canada, and the U.S.".
Its tracks use magnetic levitation and the pod glides at airline speeds for long distances. In its announcement today, Virgin Hyperloop One says that it "continues to see a growing demand from governments and the private sector around the world".
"From our airlines to our trains to our spaceline, we have always been passionate about innovation in transport too, especially the development of technology that could transform people's lives", Branson said in a statement. "I was very impressed and now look forward to helping turn this cutting edge engineering into a global passenger service".
'This is just the latest example'.
There are consumers, for instance, that would love to go from London to Edinburgh in roughly 45 minutes.
Hyperloop One, the Los Angeles-based startup working on an ultrafast tube transportation system, is no more.
The hyperloop tube is 3.3 metres wide and the pod inside can accelerate from 0 to 60mph in 1.85 seconds.
Meanwhile, Musk is now working part-time on a similar project, called The Boring Company.
Andromeda and Dead Space 3 coming to EA Access soon
It is now possible to enjoy the entire trilogy on Origin Access on PC or EA Access on Xbox One through backwards compatibility. Andromeda was roundly condemned and mocked on its release, partly because of its numerous bugs and freaky facial animations.
Death toll in California wildfire rises to 21
Shattering the previous record", says Cal Fire - the shortened name for the state of Forestry and Fire Protection agency. Some 5,000 people from the historic town of Calistoga, situated in northern Napa County, were being evacuated.
Turkish, US FMs discuss visa row over phone
Defense Secretary Jim Mattis said the dispute has not affected the U.S. military's relationship with Turkey's armed forces. President Donald Trump and Vice President Mike Pence have directly called on Erdogan in private meetings to set him free.