Advanced countries are making use of powerful electro magnets to move trains at very high speed. These trains are called maglev trains. These trains float on a guideway and do not run on steel tail trucks.
Instead of using an engine based on fissile fuels, they make use of magnetic field forces. The magnetized coil are arranged in the guideway which repel the strong magnets placed in the train's under carriage. This helps train move over the guideway, a technique called electrodynamics suspension. When current passes in the coils guideway, a typical magnetic field is set up between the under carriage of train and guideway which pushes and pulls the train along the guideway depending on the requirement.
The lack of friction and its aerodynamic style allows the train to move at very high speed.
The disadvantage of magtev train is
(a) More friction
(b) Less pollution
(c) Less wear and tear
(d) High initial cost
