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Maglev Trains

Image - http://www.magnet.fsu.edu/education/tutorials/slideshows/maglev/(external link)
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The Maglev (Magnetic Levitation) train uses a special material (YBCO - yttrium barium copper oxide - YBa2Cu3O7) that becomes superconductive if cooled at around -183C (-297F). Liquid nitrogen is used to cool the YBCO material below it's transitional temperature when it can trap surrounding magnetic flux according to the Meissner effect(external link).

The model train "levitates" above the conventional magnetic track and runs very smooth, without friction. It even has some steam around form the atmospheric condensation around the very cool locomotive body. The effect lasts only as long as the superconducting state is maintained in the material. When all the liquid nitrogen is evaporated, the material warms up from the room temperature and the superconductivity fades away leaving the ceramic material without any particular magnetic properties and thus the train stops.

Model Maglev Train from LiveVideo.com

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