The R33 was a New York City Subway car model that was built by St. Louis Car Company in 1962 and 1963. The cars are a "follow-up" or supplemental stock for the A Division's R29s and closely resemble them. The cars were also referred to as R33MLs (R33 Main Line) to distinguish them from the R33Ss. A total of 500 cars were built, numbered 8806-9305, and arranged in pairs.