The Steinway Lo-V, a New York City Subway car, was built between 1915 and 1925. These cars were built specifically for use on the IRT Corona Line (currently known as the IRT Flushing Line, used by the 7 train). They had special gear ratios to climb the steep grades (4.5%) in the Steinway Tunnels, something standard Interborough equipment could not do.
Note that the 1938 World's Fair Lo-V was technically a "Steinway" car as it also contained the special gear ratios required to climb the grades of the Steinway Tunnels. However, as the World's Fair Lo-V is significantly different, it is a separate and distinct car class and not included in the "Steinway" grouping. Therefore, none of the information on this page concerns the '38 World's Fair Cars.