Safety Air conditioning unit designed to fit on the smaller IRT cars, and by 1982, all R33 cars had received air conditioning. The cars were also rebuilt between 1987 and 1991. Before they were rebuilt, the R33 cars were grouped as follows: Cars #8806–9075 had General Electric electrical equipment Cars #9076–9305 had Westinghouse electrical equipment From 1987 until early 1991, the R33 cars were overhauled and rebuilt by the MTA's 207th Street and Coney Island Overhaul Shops. All cars were refitted with General Electric equipment. Existing General Electric cars received New York Air Brake Newtran brake packages; the former Westinghouse cars received an updated brake package from the Westinghouse Air Brake Company. After rebuilding, R33 cars served on the , , and trains, and occasionally on the train. Retirement In 1996, New York City Transit announced that it would begin phasing out all Redbirds with the arrival of the R142s and R142As, which entered service in 2000. The last train of R33s consisting of pairs 8842–8843, 9090–9091, 9240–9241, 9294–9295, 9302–9303, made its last trip on the route on April 20, 2003. Most of the retired cars were stripped and dumped into the Atlantic Ocean to form artificial reefs. 21 pairs were painted yellow and black and converted to work service as R161 rider cars RD400–RD441 from 1999 to 2007, allowing the retirement of the older R71 rider cars. RD407 (ex-8869) was damaged in a derailment and was scrapped in 2013. RD440–RD441 were further converted into de-icer cars. The R33 cars not converted into rider cars were saved for various purposes throughout the New York City Subway system. The full list includes: 8885 – converted into a rail adhesion car for the IRT Dyre Avenue Line after a derailment south of the Franklin Avenue station that led to the retirement of its mate, 8884. The car is hauled by other cars during the fall season. 8912–8913 – used as a static display at the Tiffany Street Iron Shops, a training facility for elevated structure workers in Hunts Point, Bronx. This pair was previously involved in a derailment at the 239th Street Yard. 9010–9011, 9016–9017, 9068–9069 and 9206–9207 – preserved for the New York Transit Museum. They were repainted into various vintage paint schemes and used for various purposes since retirement, mainly on the Train of Many Colors. Car 9075 was previously on display outside Queens Borough Hall in Kew Gardens, Queens.