Magnetic levitation

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A mag-lev train uses magnetic levitation to "float" on the rails. Electromagnets pull/push the train along

Magnetic levitation is an application of magnetic repulsion, most notably used for mag-lev trains. Magnetic levitation is a result of superdiamagnetism, where the current induced by a magnet remains in a superconductor indefinitely due to its lack of resistance, producing an equal and opposite magnetic field to that of the magnetic source.