Maglev trains work on the principle of magnetic repulsion between the cars and the track. The word maglev is actually a combination of the words “magnetic” and “levitation.” The magnetic levitation, or floating of the train, is achieved through the use of an electrodynamic suspension system, or EDS.

The rails, or guideways, contain two sets of cross connected metal coils wound into a “figure eight” pattern to form electromagnets. On the train itself are superconducting electromagnets, called bogies. When stopped, the train rests on rubber wheels. To begin motion, the train moves forward slowly on these wheels, allowing the magnets beneath the train to interact with those of the guideway. Once the train reaches 150 kilometers per hour (93 miles per hour), the magnetic force is strong enough to lift the train 100 milimeters (4 inches) off the ground, eliminating friction to allow for increasingly high speeds.

Source :
https://www.jrailpass.com/blog/maglev-bullet-train#:~:text=Maglev%20trains%20work%20on%20the,the%20cars%20and%20the%20track.