The R-110A and R-110B cars were prototype cars delivered to the Transit Authority in 1992. These cars were designed to test out various "New Technology" features that would eventually be incorporated into the next fleet of trains. They were not intended to be production models.
The R-110B is a prototype car for the IND/BMT division. It was made by Bombardier of Canada and entered service in 1992. There are 9 cars, numbered 3001-3009, and are coupled into three-car sets.