The Association of American Railroads Railroad Security Threat Level Alert System
The Association of American Railroads (AAR) has created a four-level threat alert system employed by NS and the other North American railroads:
Level 1: Normal day-to-day operations
Level 2: Heightened security awareness (current threat level)
Level 3: Credible threat of an attack on the U.S. or railroad industry
Level 4: Confirmed threat of attack against the railroad industry or actual attack in the U.S.
We use this alert system to respond with countermeasure activities to developing threats. The AAR alert system is tailored to the rail industry and generally matches the Department of Homeland Security’s alert plan.