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Electro-pneumatic braking is the abbreviation of electronically controlled air braking, which is formed by adding electrical control elements such as solenoid valves on the basis of air braking. Its characteristic is that the braking action is controlled by "electronic control", but the power of braking action is still compressed air. Moreover, when the electric control of the brake fails for some reason, it can still implement "pneumatic control" (pneumatic control) and temporarily become an air brake.
When the train speed is very high or the formation is very long, and air braking is difficult to meet the requirements, electro-pneumatic braking can greatly improve the consistency of braking and relieving functions at the front and rear of the train, significantly reduce the longitudinal impact of the train and shorten the braking distance. Many high-speed trains in the world have adopted electro-pneumatic braking, and quasi-high-speed passenger trains on Guangzhou-Shenzhen line and speed-up passenger cars on some trunk lines in China have also adopted electro-pneumatic braking.