One of these days on the TV I have seen news which has shaken me: Elon Musk has decided to intrigue the world - has declared that will soon open the project of essentially new personal transport. Which will move with speed of a sound, but will be cheaper than the plane . The construction cost of a line will be much lower, than for a high-speed train (something - here: http://en.wikipedia.org/wiki/Hyperloop <http://slon.ru/fast/future/elon-mask-obeshchaet-transport-budushchego-966070.xhtml) / As has told Musk it Will turn out average between "Concord", a rail gun and aerohockey. But more has told nothing: holds an intrigue. I, think, have understood in what here a secret and have decided this intrigue to break:) In my opinion - it is very simple. I am surprised that anybody has not guessed before earlier it. The line represents a pipe in which will be constantly supported high vacuum. That will provide low friction, and, hence, and high speed. But on such high speed of a wheel - will not sustain. And magnetic pillows - are expensive. It would be possible to fly, if vacuum is not so high. But to fly - always it is less energetically favourable, than to be floating on an air pillow. Therefore the "line" works so, that as soon as capsule "on" - the apertures under capsule will open and atmospheric air directs under capsule, creating effect of an air pillow. And as soon as capsule will leave from this place - the valve are there and then closed. The aero-input of air will be not big. About 0,1 atmospheres.So, friction will be in tens times less, than in an atmosphere. And powerful the aero pumps will extort constantly of air from a pipe . And speed will give magnets. Small friction about unloaded air will brake capsule nevertheless. Therefore the electromagnets will push it through everyone of ~30 kilometers. The mechanism of work of this system: I assume, that possible to improve it.