Yes, I always thought those pictures of above ground hyper-loop looked silly. It's not like you're going to be in a transparent tube (first mass use of VR plea

Yes, I always thought those pictures of above ground hyper-loop looked silly. It's not like you're going to be in a transparent tube (first mass use of VR please B^). But all of these comments are off the original expansive topic, and in fact much more relevant. Thermal expansion simply isn't a problem that needs to get solved, because holding sub-mm tolerances over a km is unrealistic, and if cost was an issue, you'd put the dann thing in the ground. Don't confuse me with someone who finds hyper-loop realistic... but don't tell me it can't be done because it needs 5 doors and to be painted a particular color of red. I don't particularly care what some ex-paypal guy who runs a car company says about it either. Engineering matters.