Ten 'Second Class' sitting cars were built for the 'Overland' service. The cars were coded BJ and were numbered 1 to 10.
Four cars were built in 1952, two in 1960, two in 1966 and two in 1968.
In 1971, BJ 1, 2 and 3 were modified internally and a Buffet section added. The cars were recoded to RBJ_ with the same numbers kept.