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Acting as a "spinal chord" of a train

Driver’s display unit in crew cab displaying the state of equipment

ATI system is a type of digital information exchange system that integrates the information collected from the ground equipment and the on-board devices for train control.
At first, the purpose of ATI was to act as a subsystem to monitor and record the status of various on-board devices. From time to time, the system evolved to a main system to act as a spinal chord of a train. It was made possible by the advancement of microcomputer and data transmission technologies.