You can't help but know the subway knowledge

First, the subway definition

       The subway is the abbreviation of the underground railway. It is an independent rail transit system that is unaffected by ground conditions and can operate as designed to deliver passengers quickly, safely and comfortably. The subway has high efficiency, no pollution, can meet the requirements of large volume, and has good social benefits.

       The subway is a rail transit, and its transportation organization, function realization, and safety assurance should follow the objective laws of rail transit. In the transportation organization, it is necessary to implement centralized dispatch, unified command, and organize driving according to the operation chart; in terms of function realization, all relevant majors such as tunnels, lines, power supply, vehicles, communications, signals, station electromechanical equipment and fire protection systems should be in good condition. In normal operation, in terms of safety assurance, it mainly relies on the normal operation of the driving organization and equipment to ensure the necessary driving interval and the correct driving route.

In order to ensure the safety and punctuality of subway train operation, under the principle of centralized dispatch and unified command, the organization, equipment, vehicle maintenance, equipment operation management and safety assurance are all regulated by a series of rules and regulations. The subway is an orderly linkage and time-sensitive system composed of multi-disciplinary and multi-work types and working together around the center of safe driving.

       In the subway, various automation equipments based on electronic computer processing technology are adopted, which replaces manual, mechanical and electrical driving organization, equipment operation and safety assurance system. Such as ATC (train automatic control) system can realize automatic train driving, automatic tracking, automatic scheduling; SCADA (power supply system management automation) system can realize remote control of main substation, traction substation, step-down substation equipment system, Remote communication, telemetry; BAS (environmental monitoring system) and FAS (fire alarm system) can realize automation of station environmental control and automation of fire protection and alarm system; AFC (automatic ticket inspection system) can realize functions such as automatic ticket sales, ticket checking, classification, etc. . Each of these systems forms a network, and each center computer is set up in the OCC (Control Center) to implement unified command and hierarchical control.