The first R36 cars ("World's Fair" cars 9558–9561) arrived in fall 1963, shortly after the R33S cars began arriving in September that year. The first train of R33S and "World's Fair" R36 cars was placed in service on the route on October 24, 1963. With the fair opening approaching on April 12, 1964, "World's Fair" R36 cars were built and delivered in larger quantities that fall. More "World's Fair" cars arrived throughout 1964, enough to displace the R12s, R14s, and R15s from the train by the close of 1964.