Advanced Train Control System

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"ATCS" redirects here. For other uses, see ATCS (disambiguation).

An Advanced Train Control System, usually called ATCS, is a system of railroad equipment (hardware and software), designed to ensure safety by monitoring locations of trains and locomotives, providing analysis and reporting, and automation of track warrants and similar orders.[1]

ATCS specifications are published by the Association of American Railroads (AAR), and are designed to document the stated requirements of railroad operational and technical professionals concerning ATCS hardware and software.[2] These specifications are designed to facilitate compatibility and standardization without limiting the internal design approaches of individual suppliers.


  • ATCS Specification 110: Environmental Requirements
  • ATCS Specification 130: Recommended Practices for Software Quality Assurance
  • ATCS Specification 140: Recommended Practices for Safety and Systems Assurance
  • ATCS Specification 153: System Logic - OBC
  • ATCS Specification 154: System Logic - CDC
  • ATCS Specification 155: System Logic - WIU
  • ATCS Specification 156: System Logic - TFT
  • ATCS Specification 160: Configuration Management Plan
  • ATCS Specification 200: Communications System Architecture
  • ATCS Specification 210: Mobile Communications Package
  • ATCS Specification 220: Front End Processor
  • ATCS Specification 225: Cluster Controller
  • ATCS Specification 230: Base Communications Package
  • ATCS Specification 250: Message Formats
  • ATCS Specification 300: Locomotive System Architecture
  • ATCS Specification 310: Locomotive Computer
  • ATCS Specification 311: Predictive Enforcement Braking
  • ATCS Specification 320: Locomotive Displays & Controls
  • ATCS Specification 335: Transponder/Interrogator
  • ATCS Specification 400: Dispatch System Architecture
  • ATCS Specification 500: Field Systems Architecture
  • ATCS Specification 530: Wayside Interface Unit
  • ATCS Specification 600: Work Vehicle System Architecture
  • ATCS Specification 610: Track Forces Terminal
  • ATCS Specification 620: Work Vehicle Display and Control Unit

See also[edit]


  1. ^ American Railway Engineering and Maintenance-of-Way Association, Lanham, MD (2003). "Glossary: General Railway Definition and Common Railway Terms." Practical Guide to Railway Engineering.
  2. ^ Association of American Railroads, Washington, DC (2005). "Manual of Standards and Recommended Practices. Section K: Railway Electronics."

External links[edit]