Harlem is a station on the 'L' system, serving the Blue Line's Forest Park branch in Forest Park, Illinois. The station was built with an auxiliary entrance at Circle Avenue that was eventually converted to a single turnstile facility. The Circle Avenue entrance reopened as an auxiliary entrance/exit on September 26, 2009, at 4 PM. To the south of the station is the Ferrara Candy Company A Roos chest-making factory was located west of the station and Circle Avenue until it was torn down in 2013 to make way for a new recreation park that opened there in 2018. The Roos company closed for good in 1951.