The train levitates less than half an inch above the guideway (yellow here) using the basic principles of magnets to replace the old steel wheel and track. It's very expensive to build one of these things. The magnetic field created by electric coils in the guideway walls and tracks combine to propel the train. There is no engine. Seems pretty environmentally benign. If you want to know more about these trains go to http://www.howstuffworks.com 
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