Vactrain

A vacuum tunnel refers to a tunnel in which there is carried out pumping of air, a lower air pressure, that is an at least approximate vacuum.

Would be moved in a vacuum tunnel vehicles, for the same energy consumption, a higher speed is possible, as the air resistance, which grows quadratically with the speed, would be smaller. Just not the big tube diameter instantaneous high-speed rail tunnel would be required, which are needed to one that tries to the displaced air not only before the train.

Sorry, we could not implement any practical applications of this concept. Consider was to use it in combination with magnetic levitation technology for the Swissmetro.