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- There are often inconvenience of feeling ear-ringing while taking a high-speed trains or airplanes. These phenomena occur by pressure-difference between indoors and outdoors of a passenger section, and in case of high-speed railroad, it happens during going through a tunnel. However, when the speed of the train is over 5km/h, high-speed train intercept the outer air with swollen rubber around the entrance due to computer orders in passenger car. Especially, it automatically shuts down the ventilation system while going through a tunnel in order to prevent ear-ringing phenomena by restraining air changes inside the passenger car.
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