They were single-ended, low-floor cars designed for operation by a single man and were built largely of aluminum to save weight and, therefore, require less power to operate. The biggest difference from the C&LE cars was in the trucks: whereas the C&LE cars had smaller arch-bar trucks, the IR cars were designed with heavy Commonwealth cast steel trucks designed specifically for high-speed service and to cope with poor light rail track.
These vehicles were single-ended, low-floor designs intended for solo operation by a person. They differed from the C&LE cars in their truck design: whereas the C&LE cars used smaller arch-bar trucks, the IR cars featured heavy Commonwealth cast steel trucks designed specifically for high-speed service and to handle poor track conditions.