[1][2] These 50 cars were ordered for the IRT Flushing Line in preparation for the 1939 World's Fair.

This included an ogee-styled roof (which on the last 10 cars were insulated), a door arrangement similar to those of BMT cars (eliminating vestibules), end destination rollsigns and insert marker lights, smaller size sign plates on the side that could more easily be changed at terminals, and a single circuit lighting hookup (similar to what the IND cars had).

After the fair closed, they continued to operate on that line until 1950, when they were displaced by the new R12, R14, and R15 subway cars.

In 1962, deemed surplus by the vast number of new IRT subway cars being placed into service during this period, they were transferred to the IRT Third Avenue Line in the Bronx, where they spent their final years until they were replaced by the heavily modified R12s in late 1969.

[5] Media related to World's Fair Lo-V (New York City Subway car) at Wikimedia Commons