Did you notice the automatic door in Hengshan Road Metro Station?
© Jian Shuo Wang. The automatic door experiment of Hengshan Rd. Station of Metro Line #1
It has been installed for almost one year I remember, but very few people noticed the doors. It is for experiment. According to a old news report, the door will be installed to all underground metro stations after it is proved to be functioning. Now, when metro train comes, the door opens and closes with the doors of the train. Since it is installed on one end of the station, the train does not actually use it. It opens and closes, just to test whether it always works.