What is Maglev? How it can have very high speed?
MAGLEV is an acronym of magnetic levitation. The most spectacular applications of this would be maglev trains. The coaches of the train do not slide over steel rails but float on a four inch air cushion above the track using Meissner effect of super conducting magnets.
The current flowing through its horizontal coils produce a vertical magnetic field. By Meissner effect the superconducting magnet S expels the vertical magnetic flux. This levitates the train and keeps it afloat the guide way, the horizontal coils are thus called levitating coils. On the other hand current passing through the vertical coil produce a horizontal magnetic field which pushes the train forward. Thus the vertical coils are called propelling coils.
The train is fitted with retractable wheels similar to the wheels of an aircraft. Once the train is levitated in air the wheels are retracted into the body and the train glides forward on the air cushion.