Space X founder, Elon Musk, has been hinting again about his much-vaunted 'Hyperloop' transport system.
The super-high speed link would connect Los Angeles with San Francisco and be "a cross between a Concorde, a rail gun, and an air hockey table".
Speaking at a D11 conference he told the crowd current plans for a high-speed rail link between the two cities is too slow and too expensive.
Musk is also the CEO of Tesla
He promised further details of 'Hyperloop' would be available on 20th June.
This system I have in mind, how would you like something that can never crash, is immune to weather, it goes 3 or 4 times faster than the bullet train… it goes an average speed of twice what an aircraft would do. You would go from downtown LA to downtown San Francisco [600 miles] in under 30 minutes. It would cost you much less than an air ticket than any other mode of transport. I think we could actually make it self-powering if you put solar panels on it, you generate more power than you would consume in the system. There's a way to store the power so it would run 24/7 without using batteries. Yes, this is possible, absolutely.
Musk is no stranger to ambitious projects. Space X is already on the way to developing a reusable rocket that could slash space travel costs.
Space X capsules already deliver cargo to the International Space Station.
He has also expressed a desire to start a colony for 80,000 people on Mars.