 It serves the Blue Line's two tracks; the northern track serves trains to O'Hare, while the southern track serves trains to Forest Park.Electronic signs on the platform offer real-time information about train arrivals and service alerts; Cumberland is one of four 'L' stations with these signs, which were installed in 2002 as part of a pilot program.A pedestrian overpass connects the platform to entrances on the north and south sides of the expressway.