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A section of superconducting material is cooled using liquid nitrogen and then placed on a magnetic track. The material expels the field produced by the track and causes it to levitate.
type 1 Magnetic track rails type 2
The superconductor sets up surface currents which cause the applied field from the track to be completely expelled.
As the superconductor heats up through its transition temperature, the field from the magnetic track begins to penetrate and the sample ceases to levitate.