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Levitation. Maglev trains have no contacts with the rails while they move forward. They are levitated on the guide-way with the help of magnetic forces. Levitation is the process by which an object is suspended against gravity in a stable position without any physical contact.
Those magnets are on the track and on the train. The essentially push the train up from the track, making it 'float' or levitate, as in the 'lev' bit on MagLeg. It's a great concept, as, on normal trains (or pretty much most ground transportation vehicles), friction has to be overcome.