Design: Top grade design China's earliest subway line-Beijing Metro Line 1 safety gate was officially put into use on September 10, 2017
As the earliest subway line built in the capital, Line 1 has not installed safety screen doors due to various historical reasons such as tunnel ventilation, platform load-bearing, civil foundation, and train stopping accuracy. Line 1 is a "high incidence area" of accidents or man-made accidents on all subway lines in Beijing 」. There have been 21 suicides since the subway was built. When there is a riot and suicide, the train will be forced to stop waiting to deal with the problem. This kind of problem affects the public travel law and time, and wastes public resources. The main function of the security door is to effectively avoid such problems and thus ensure public order.