"Take the Hyperloop. Has no one spotted the massive amounts of rust which you can see forming on the inside of the currently build test track? Every time a reporter films and gives you a shot of the inside then you can see it for yourself. That's not an example of good engineering and it can cause many problems in the future, but it seems no one cares."
-If I build a quick and dirty concept demonstrator (and I often do.. sometimes even in LEGO), I do not bother with corrosion protection unless this has direct impact on the concept that I am demonstrating.
The hyperloop tube itself will require serious engineering. Engineering the hyperloop tunnel BEFORE engineering the hyperloop capsule is what leads to engineering marvels like the F35 and the Space shuttle.