The only fast and convenient travel is via plane; bus, trains are incapable of matching travel by air.
In the Nat Geo amazing I just saw, the maglev (magnetic levitation trains) without engine are capable of speeds well over 500 kmh. The engineering and physics are amazing: the train levitate on magnetic track, and the repulsion, and the coils along the track is the engine.
Maglev trains
Maglev trains in Japan run at 580 kmh
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