The R11 was a prototype class of experimental New York City Subway cars built by the Budd Company in 1949 for the IND/BMT B Division. A total of ten cars were built, arranged as single units. Originally consisting of 400 cars, only ten R11s were built, due to the cancellation of the Second Avenue Subway.

The Budd Company was a 20th-century metal fabricator, a major supplier of body components to the automobile industry, and a manufacturer of stainless steel passenger rail cars, airframes, missile and space vehicles, and various defense products.