In 1964, picture window R33S and R36 cars replaced the older R12s, R14s, R15s, and R17s in time for the 1964 New York World's Fair. Early in 1965, the NYCTA placed a strip map indicating all the stations and transfer points for the line in each of the line's 430 cars, helping World's Fair visitors. This innovation was not used for other services and as they shared rolling stock with each other; it was possible for cars to have the wrong strip maps.