Pressure wave moves at speed of sound. Lightweigh capsule gets destroyed just by derailing at 500mph. Any bad event will put down ALL trains on track. And rescuing people trapped in 100 miles long steel pipe...
Hyperloop is a nightmare!
Hyperloop is a nightmare!
https://en.m.wikipedia.org/wiki/Hagen%E2%80%93Poiseuille_equ...
Edit: To give a good analogy: Electricity also travels at the speed of light through a cable, however due to resistance you will get different current reading depending on where you measure.