Overview

• Metra reported around 5 p.m. that trains on every commuter line experienced positive train control issues that triggered automatic stops.
• By about 6:15 p.m., the system was slowly coming back online and trains began moving, with extensive delays expected through the evening.
• Officials said the cause of the outage remained unknown Tuesday evening as recovery and verification continued.
• Positive train control automatically stops trains when signals are missed or speeds are exceeded to prevent collisions and derailments.
• Because the safety system must be engaged under Federal Railroad Administration requirements, Metra cannot run trains when it is offline.