These cars make up most of the Blue Line fleet and all of the Orange Line fleet, and car 3458 (originally car 3032) can be found on the Brown Line. In June 2014, as more 5000-series cars were being delivered, The CTA began to transfer the Red Line's 2600-series cars to the Blue Line due to them being newer than the existing 2600-series Blue Line cars, transferring the Blue Line's older 2600-series cars to the Orange Line as an interim replacement for its 2400-series cars until the Red and Purple Lines are fully equipped with the 5000-series cars.