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By Masood Sattar Khan  (Pakistan News & Features Services) The subway trains in Beijing were testing a smart service system that included inspection cameras and LED windows showing useful transport information to passengers as country was swiftly recovering from its past glories following Coronavirus (COVID -19). The system, called Intelligent Passenger Service System, provides convenience and care services for passengers, according to its developer.  As part of the system, some high-definition cameras are installed in train carriages, used to capture passengers' unusual conditions, such as whether they are wearing face masks or if somebody falls in a faint or waves for help, Li Yujie, deputy head of Beijing Subway's Technical Department has said.  High-definition screens also can be seen from areas over the train's doors, showing different information, including lines and the degree of crowding in neighboring carriages.  Also, the train's windows, combined with ...