The Red Line (Howard-Dan Ryan Service) is a heavy rail line in Chicago, run by the Chicago Transit Authority (CTA) as part of the Chicago 'L' system. It is CTA's busiest rail line, serving more than 213,800 passengers each weekday. The route is 23.4 miles long with a total of 34 stations, from Rogers Park (Howard Street) on the City Limits north, through downtown Chicago, and to Roseland (95th/Dan Ryan) on the south.