It looks very suspictious. Is there a technical description?<p>In the explanation in <a href="https://www.youtube.com/watch?v=lHCKYJG-tII&t=60s" rel="nofollow">https://www.youtube.com/watch?v=lHCKYJG-tII&t=60s</a> , he claims it's hanging from the upper rail insted of repealing the bottom rail. This makes a lot of sense. But in the test in the other video of "existing rails" <a href="https://youtu.be/4m6nJM8DQ4M?t=37s" rel="nofollow">https://youtu.be/4m6nJM8DQ4M?t=37s</a> there is no upper rail.<p>Also, they claim some electronic estabilization system, but no electricity or power source.<p>And in the first viveo, when he shows a no friction demosntration <a href="https://www.youtube.com/watch?v=lHCKYJG-tII&t=149s" rel="nofollow">https://www.youtube.com/watch?v=lHCKYJG-tII&t=149s</a> it slows down so much that they have to cut the take.<p>And I'd expect a lot of eddy currents, that in some cases are bigger than friction <a href="https://en.wikipedia.org/wiki/Eddy_current#Electromagnetic_braking" rel="nofollow">https://en.wikipedia.org/wiki/Eddy_current#Electromagnetic_b...</a><p>This part of the wikipedia article is interesting <a href="https://en.wikipedia.org/wiki/Eddy_current#Repulsive_effects_and_levitation" rel="nofollow">https://en.wikipedia.org/wiki/Eddy_current#Repulsive_effects...</a><p>> <i>n a varying magnetic field, the induced currents exhibit diamagnetic-like repulsion effects. A conductive object will experience a repulsion force. This can lift objects against gravity, though with continual power input to replace the energy dissipated by the eddy currents.</i>