trainsets (one on the Brown Line and one on the Orange Line) were retrofitted with LED destination signs similar to those on the 5000-series cars as a project for a mid-life overhaul for the cars. The overhaul plans were approved on August 14, 2014. In addition to new LED destination signs, new LED run number boxes, including car 3458 (except cars 3227-28), new air conditioning systems are being installed, and the propulsion systems, passenger door motors, and wheel and axle assemblies were rebuilt. The 3200-series rehabilitation began in 2015 and was completed in 2018. In Summer 2015, rehabbed Brown Line cars began appearing in service. Retirement If the options get picked up, the 3200-series cars currently in service are expected to be replaced by the new 7000-series cars. References External links http://www.chicagotribune.com/news/local/breaking/ct-cta-rail-car-rehab-met-0212-20150211-story.html Chicago "L" rolling stock Train-related introductions in 1992 Morrison-Knudsen multiple units