An Advanced Train Control System (ATCS) is a system of railway/railroad equipment designed to ensure safety by monitoring locomotive and train locations, providing analysis and reporting, automating track warrants, detecting blind spot and similar orders. ATCS specifications are published by the Association of American Railroads (AAR), and are designed to document the stated requirements of railway/railroad operational and technical professionals concerning ATCS hardware and software.
- "Glossary: General Railway Definition and Common Railway Terms" (PDF). AREMA.org. Lanham, Maryland: American Railway Engineering and Maintenance-of-Way Association. 2003. Archived from the original (PDF) on June 13, 2010.
- Association of American Railroads, Washington, DC (2005). "Manual of Standards and Recommended Practices. Section K: Railway Electronics." Archived March 27, 2009, at the Wayback Machine
- "What is ATCS?" - Background and technical data