Chicago Blue Line Adapts With Single-Track Service
Blue Line to run single-track service between Addison and Montrose starting Nov. 17
Blue Line Adds Single-Track Service Nov. 17
Chicago's Blue Line will operate on a single track between Addison and Montrose stations starting November 17, transit officials said. Riders should expect boarding changes and minor delays as trains in both directions share one track. The CTA classified the change as high severity but didn't specify how long single-track operations will last.
Background on Single-Track Operations
Single-track operations are standard practice when transit agencies perform maintenance, inspections or repairs while keeping service running, according to the transit agency. The Federal Transit Administration requires regular track inspection and maintenance for all rail systems. The CTA hasn't specified the reason for the single-track operation between Addison and Montrose. Transit agencies typically use this approach to minimize service disruptions during necessary track work, though it requires trains to wait for clearance before proceeding through affected areas.
Impact on Blue Line Service
The affected section serves part of the Blue Line's 26.93-mile route, which includes 33 stations and carries about 64,000 passengers on an average weekday. Officials advised riders to allow extra travel time but didn't provide specific delay estimates. The CTA said passengers should expect boarding changes during the single-track period. Cost information for the work wasn't available. The Blue Line connects O'Hare International Airport to downtown Chicago and continues to the Forest Park branch, making it a critical route for both airport travelers and daily commuters.
Timeline and Duration
The single-track operation begins November 17, according to the transit agency's service alert posted in November 2025. Officials haven't announced when normal two-track operations will resume between Addison and Montrose. The CTA said it'll provide updates as the situation develops and notify riders when regular service returns.
What Riders Need to Know
Passengers using the affected Blue Line section should plan for extra commute time and consider alternative routes if schedules are tight. The CTA recommends checking for service updates before traveling. Moovit provides real-time Blue Line updates and alternative route options for Chicago transit riders. System-wide, the CTA serves approximately 1.1 million weekday trips across all services, down from pre-pandemic levels of around 1.6 million.
