From: www.chicago-l.org/operations/lines/pink.html The Pink Line is the newest route on the CTA® rapid transit system, created in 2006 by overlaying a new service onto existing infrastructure. The Pink Line runs from 54/Cermak station in west suburban Cicero to the Loop Elevated in downtown Chicago through the West Side of the city, over the Cermak (Douglas) branch, Paulina Connector, and Lake Street branch of the Green Line. The Cermak and Paulina sections were extensively rehabilitated or reconstructed in 2001-2005. en.wikipedia.org/wiki/Pink_Line_(Chicago_Transit_Authority) The Pink Line (Douglas-Loop Service) is a rapid transit line in Chicago, run by the Chicago Transit Authority (CTA) as part of the Chicago 'L' system. It began operation for a 180-day trial period on June 25, 2006, running between 54/Cermak Station in Cicero, Illinois and the the Loop in downtown Chicago. The CTA has since added two six-month extensions to this trial. The route to the Loop follows tracks shared with Green Line trains on Lake Street, connected by the previously non-revenue Paulina Connector.