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Why build trillion dollar 20 year plan infrastructure for a flying train when aircaft already do this and can change destinations at the drop of a hat. The energy saved by the train would be small compared the energy consumed by the construction of the infrastructure to support it. Unless you are looking for a jobs program for a political candidate.

If you can improve the efficency of systems that use existing infrastructure-IE: low friction or electromagnetic berings or superior high efficent propulsion systems for aircraft and cars etc. then you have something.