Conrail's B63B class was composed of 162 also built by Berwick in 1978. Because of differences with interior bulkheads and load-restraining apparatus, these cars differ in appearance from the older B63A classes primarily in the location of the "waffles" on the sides of the cars. Conrail 223301-223432 was equipped with bulkheads and rub rails for hauling engine blocks, while Conrail 223433-462 lacked these devices and were used in general pool service.
