The R33 World's Fair (R33 WF) is a model class of cars for the 7 Train (IRT Queensborough line) in the New York Subway, built in late 1963. 40 cars were built as singles. They were used to make 11-car trains with R36 cars, which were built as 2-car sets (pairs) (the 7 had ran 11 cars for many years). They were built by the St. Louis Car Company, in Saint Louis, Missouri, USA for the 1964 New York World's Fair.

As of this time (2004), only one car (9321) has been scrapped; all other cars are in work service or on the active roster as spares for revenue service. 9306 is on the New York Transit Museum roster and sees revenue trips from time to time.

They are based out of Corona Yard (on the 7), in the Corona section of Queens near Shea Stadium. Other R33 WF's in work service are based out of various yards around the system. The R33 WFs that are in non-revenue (work service) handle many tasks and are versatile, doing car moves, trash pickup and yard switching.

R33 WF Specs

• Car Numbers: 9306-9345
• Car body: Carbon steel (LAHT alloy unibody construction)
• Length 51' 1/2
• Width 8' 9
• Height 11' 10 3/8
• Seating: 44
• Propulsion: Westinghouse XCA248E
• Braking: WABCO, "SMEE"
• Motors: WH 1447C (100 HP, 4/car)
• Coupling/Numbering Arrangement: Single (9306-45)

These cars were retired by the TA in 2003.