|Historical notes: ||Sitting and buffet carriage RDH 2220 entered service in April 1948 as one of eight first-class cars in the HUB sets and coded BH. Originally, the car sat 36 in 2 and 1 rotating and reclining B-Type seats of a different style to the later RUB set cars, but these were replaced by 2+2 seats of the same style as the RUB set cars in early 1964. The new seating capacity was 48, and toilets were located off each entrance.
In November 1984, BH 2220 was converted and recoded BHZ. This conversion involved the installation of a centre partition to separate smoking and non-smoking areas in the single saloon. Between July 1983 and October 1988 a total of five cars (BH 2220, 2221, 2222, 2224 and 2225) were converted and recoded BHZ. In 1989, BHZ 2220, 2221, 2224 and 2225 reverted to the BH code, with only the top of the partition in the ceiling area remaining.
Between 1987 and 1989 Nos. 2220, 2222, 2223 and 2227 were rebuilt with two lavatories at one end, enabling the fitting of 60 first-class rotating and reclining seats, and were recoded BHA. These cars were to provide better seating for economy class passengers on the overnight trains.
In order to permit the reintroduction of limited locomotive-hauled services to Broken Hill and Griffith in 1996, BHA 2220 was converted to an unclassed/buffet car and recoded RDH in June 1996. A total of eight cars have carried this code. The first seven, converted from HUB set buffet-sitting cars, were involved in the day-nighter conversion program. These cars had the buffet area enlarged and rebuilt to include a sales counter. The cars were altered to work with the ABS dining cars on the Gold Coast Motorail, as the ABS cars had no facilities for take away-meals or refreshments. There were only minor differences between the former RBH and RFH cars, since the RFH doors were relocated to the RBH locations.
The original intention was to provide a small lounge area beside the buffet, but this was not proceeded with, as it would have reduced seating capacity. The former ladies' toilet in the RBH became the staff toilet. New toilets for both sexes were located at the former men's end. The cars sat 30 in the new configuration. Those cars converted between 1975 and 1977 had carpet placed along the wall below the window line and on part of the ceiling to improve sound insulation.
Nos 2232, 2235, 2237 and 2238 were renumbered 2752, 2155, 2157 and 2758 between July and December 1981, reverting to their old numbers in mid-1982. RDH 2232, destroyed by fire at Coopernook, was condemned in May 1983. Following the cessation of the locomotive-hauled air-conditioned trains to Brisbane and Murwillumbah in 1990, RDH 2235, 2236 and 2238 were withdrawn. No.2239 was sold to Steamrail after condemnation.
The eighth conversion to this class occurred in June 1996, when BHA 2220 was altered for use on the re-introduced locomotive hauled services to Broken Hill and Griffith. Along with 2233, it was still on the books in July 1999.