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.

The Bowling Green–South Ferry shuttle was a shuttle service of the New York City Subway system that operated between Bowling Green and the inner loop platform at South Ferry. It operated to provide South Ferry service for IRT Lexington Avenue Line riders during hours when the 5 service did not stop at South Ferry. Because the inner loop station that the shuttle used at the South Ferry station was on such a tight curve, there was no continuous platform; instead four openings in the tunnel wall led into the station. Four R12 cars that were used on the shuttle, 5703–5706, which were modified and equipped so that only the center door of each car would open at one of the open spaces.