But only low-speed maglev trains are in commercial use today. Maglev trains have several advantages over other high-speed trains. For example, they can reach higher speeds and operate more quietly. Their guideways need little maintenance. In addition, maglev trains use electricity for power and therefore produce little pollution themselves.
Electromagnetic maglev uses magnetic attraction.
Electrodynamic maglev was invented in the early 1960's by nuclear engineer James R. Powell and physicist Gordon T. Danby of the United States. The magnets are placed on the bottom of the train. The opposing magnetic force between the magnets and the induced currents lifts the vehicle. The train runs on wheels until it gains enough speed to lift off the guideway. Separate electric currents pass through other coils in the guideway.