Maglev Train is a Magnetic Levitated
( no friction ) train.
If you ever played with magnets , you know that unlike poles attract each other and like poles repel each other.
This is the basic principle behind Maglev Trains.
In Maglev Trains there are strong electromagnets attached at the bottom of the train ( i.e ;- at the place of wheels ) and also at the place of railway tracks.
These electromagnets produces a repulsive action and hence makes the train at some distance above from the tracks.
The big difference between Maglev train and conventional trains is that Maglev trains do not have an engine and wheels.
But it has a source which produces thrust energy for its forward movement ( e.g ;- big fan ).
Because of the elimination of wheels and rail tracks and also because the train is at some distance above from the tracks , there is no mechanical friction and hence energy losses are minimized.
At present Maglev Trains are the fastest trains in the world with a top speed of 430 km/h.