Hyperloop’s greatest challenge is to provide smooth bump-free travel at high speeds.
It is likely that the maximum speed is limited by the achievable accuracy of the tube.
A resilient suspension system is important
The Tube - accuracy and construction
The vacuum tube is the heart of Hyperloop. It is by far the biggest expense, and the quality of it affects the experience for the passengers.
The surface of the round tube is the perfect solution for the correct banking angle in curves.