This is a conceptual model were an air duct is used instead of electric fan inside the train coach. This concept is developed by considering present model of Indian railway.
When the train moves forward the air flows inside the duct and been released through the nozzle inside the coach. As we know that the nozzle will increase the velocity of the air flow, a good air circulation is achieved inside the coach.
The air intake duct is kept in such an angle were the rain water will not flow through the duct and come out of the nozzle. Hence, it is suitable for all the season's.