The World's Fair Lo-V was a New York City Subway car type built in 1938 by the St. Louis Car Company in St. Louis, Missouri. These 50 cars were ordered for the IRT Flushing Line in preparation for the 1939 World's Fair. They were the fourth and last "Lo-V" type cars that were ordered, and the last cars ordered for the IRT before the city takeover in 1940.

The Standard Lo-V was a New York City Subway car type built from 1916 to 1925 by the Pressed Steel Car Company, American Car and Foundry, and Pullman Company for the IRT. A total of 1,020 cars were built, which consisted of 725 motors and 295 trailers. It was the third and most common "Lo-V" type car ordered for the IRT.