The passenger information system (PIS) is an automated system used to offer information about the nature and state of the public transport services to the users of public transport systems. It is an operating tool responsible for providing audio and visual information to passengers at stations and transfer facilities at any time, thereby enhancing the rider's comfort and optimizing the communication between drivers, passengers, operations centers, and maintenance crews. The information such systems provide can be static/scheduled or real-time information, which changes continuously as a result of real-world events. The PIS comprises many subsystems, such as train communication, backbone network, radio, video surveillance, public address, passenger emergency telephony, multichannel voice recorder, and real-time display.
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