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. 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.