Diagram of a Maglev test centre's guideway and control equipment, Japanese National Railways. Maglevs work by magnetic levitation. Instead of travelling on wheels on a track, the car hovers up to 2 cm above a metal track and is pulled along by magnets. The advantages of the maglev system are there are no moving parts to wear out, no maintenance is required and it hardly makes any noise. However they are extremely expensive to build.
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