Railway A9 brake valve overwhelming kaise karte hai  

is video me A9 brake valve ka overwhelming kaise karte hai wo btaya gya hai.
The A9 Automatic Brake Valve maintains 5kg/cm2-air pressure in Brake Pipe System against normal leakage at its release position. It also maintains air pressure drop in the system according to its handle position. #airbrake #locomotive #viral #indianrailways #viralvideo #views #video #electronic #trending