hold on a second. a tube? Can a ballistic missile even travel that fast? Imagine: "So, where should we have lunch, today?"
A missile has to battle wind resistance. This would operate in a vacuum like it was traveling through space.
An ICBM ballistic missile (is that redundant) travels through space. And it avoids the curvature on the Earth.
Remember. Warren Buffet bought Burlington Northern completely with cash as a "bet on rail". Isn't rail often called a "tube"