Metro screen door is to prevent passengers from entering the rail area and equipment area by mistake or intentionally, and also to prevent foreign matters from falling into the rail area and affecting the normal operation of the train.

Prevent passengers from being sucked by the strong negative pressure generated by the high-speed train without stopping to get on and off passengers, resulting in tragedy. Since there is no need to set a safety yellow line distance of nearly one meter after the installation of PSD, some space can be made for the subway platform.

There is no example of screen door. Pay attention to the space outside the yellow line

After the PSD is set up, theoretically, the whole platform space can be used for passengers waiting

Isolate the tunnel from the station so that they do not affect each other.

On the one hand, it can reduce the load of station air conditioning and refrigeration, so as to save energy.

On the other hand, it is convenient to organize the air flow in the tunnel space, which can reduce the resistance during train driving and keep the air "fresh" in the tunnel.

It provides convenience for passenger flow control and train dispatching in peak hours. For example, the train will fly to the station when the empty train is fighting the fire, and many people will get used to leaning forward when they see the train entering the station. Too many people will have uncontrollable accidents. PSD has sound insulation effect, which can reduce the noise loudness heard on the platform, especially the running noise of the train in the curve before entering the station. However, some carefully designed screen doors can make different sounds under the action of tunnel piston wind, bringing a "pleasant" physical and mental experience to passengers waiting on the platform.