"Main Line" R36s were removed from the and those were only assigned to the . Those cars stayed on the until June 20, 1984, when Westinghouse "World's Fair" and "Main Line" cars 9514–9533 were moved to the . The remaining Westinghouse "World's Fair" R36s assigned to the were then moved to the on July 5, 1984. Then the last "Main Line" cars assigned to the were also moved to the on February 15, 1985, and the R36s were assigned exclusively to the , expect from April 1985 to early May 1985, when "Main Line" cars 9534–9557 were assigned to the . Rebuilding Though all cars were originally delivered without air conditioning, all cars in this series gradually received air conditioning as part of a retrofitting program to replace the cars' original Axiflow ceiling fans. The program started in 1976, and by 1982, all cars had received air conditioning as part of the program. The "World's Fair" R36s were the first cars to be rebuilt in the NYCTA's General Overhaul Program (GOH) in the 1980s. This program improved car life by rebuilding older cars and keeping other cars in a state of good repair. A trial rebuild program was done on selected Westinghouse R36 cars in 1981–83; the selected cars were rebuilt by Morrison–Knudsen in Hornell, New York. Beginning in late 1984, the other R36 cars were rebuilt at a rate of 200 cars per year, with the majority of them done in-house at the Coney Island Shop. Others were rebuilt by General Electric in Buffalo, New York, and by Amtrak at its Beech Grove, Indiana, and Wilmington, Delaware shops. The last remaining cars were sent out for rebuild in late 1985, and by 1986, all cars were back in service. After rebuilding, the R36 cars were repainted in a scheme involving a deep maroon red body, black front bonnets and anti-climbers, and a silver roof prior to returning to service. At first, the scheme was known as "Silver Fox", "Broad Street Red", or "Gunn Red" (after NYCT chief David L. Gunn) and was a graffiti-resistant red. By 1989, the Gunn Red would evolve into the "Redbirds" scheme best known to many New Yorkers, with beige interiors, red exterior paint and interior doors and black, and silver exterior trim along with the car windows, roof, and undersides. In 1999, the R36 cars were the most reliable in the NYCT fleet, with