Blue Line has shuttle buses for service changes until August 12

Signal improvements, which are part of the Your New Blue modernization program, are the cause of possible delays along the Blue Line until Mon., Aug. 12, morning.

Shuttle buses will replace rail service between Jefferson Park and Harlem.

Trains will operated between O'Hare and Harlem (O'Hare branch) between Jefferson Park, downtown and Forest Park.

The Chicago Transit Authority (CTA) advises riders to allow for travel time with any trip between O'Hare and Jefferson Park.