 Most of the Pink Line's 2600-series cars were reassigned to the Blue Line to replace its 2200-series cars.In 2002, the CTA proposed the creation of the "Circle Line", which would utilize segments of existing rail lines to keep new construction to a minimum, in addition to of new subway and elevated segments to the 'L' system to complete the circumferential route.Maps additionally suggested a possible extension of the existing Brown Line beyond the Loop to 54th/Cermak via the Green Line and the Paulina Connector, and Orange Line service from to , as other potential routings using the new infrastructure.