...which should be in the train? When a train moves in a great speed,the wind flows in the opposite direction in a large force.So by this fact i think if we implement a wind turbine in the train then the electricity required for train can be fulfilled to some extent.So that we can reduce the use of outsource electric energy,which can be used for another purpose.

can it be possible ?
if no then why?
if yes then it should be implemented............................