Modern train are based on maglev technology in which trains are magntically levitated, which runs its EDS maglev system. There are coils on both sides of wheels. Due to motion of the train, current induces in the coil of track which levitate it. This is in accordance with Lenz's law. If train lowers down then due to Lenz's law, repulsive force increase due to which train gets uplifted and if it goes much higher then there is a net downward force due to gravity. The advantage of Maglev trains in that there is no friction between the train and the track, thereby reducting power consumption and enabling the train to attain very high speeds. Disavantage of Maglev train is that as it slows down, the electromagnetic forces decreases and it becomes difficult to keep it levitaited and as it moves forward according to Lenz's law there ia an electromagnetic drag force. Which force causes the train to elevate up?