I'm pretty sure they just used a crane to prove the concept. It would be pretty dumb for them to use a bunch of expensive cranes for a permanent installation.

I'm pretty sure they just used a crane to prove the concept. It would be pretty dumb for them to use a bunch of expensive cranes for a permanent installation. I have to say, though, I think you might be onto something with your horizontal/angled conveyor idea. I would be worried about the energy lost to friction, though? The nice thing about a straight up/down solution is that it doesn't have that problem.