article: Blue Line (CTA)
links: Direct current Pink Line (CTA) Rosemont, Illinois O'Hare International Airport Forest Park, Illinois Red Line (CTA) Chicago Transit Authority Illinois Volt SEPTA O'Hare station train crash Third rail Chicago "L" Yellow Line (CTA) Chicago, Illinois West Side, Chicago BBC News Online Rapid transit Chicago Loop New York City Subway Green Line (CTA) Purple Line (CTA) Philadelphia Oak Park, Illinois