The low sided wagon on the standard post-war 18'-0" chassis was class HC. A total of two hundred and seventy of these wagons were built by Birmingham Railway Carriage and Wagon Co in 1952 (21401-21625), 1953 (21626-21650) and 1961 (21651-21670).

All of the HC class started with corrugated sides but at least one wagon (21605) ended up with replacement flat sides (lower photo).

HC class wagons formed the basis for conversion to a number of other classes including HCN, HCP, NF, NO, NW and NA . Details of these conversions and the fate of the rest of the wagons are listed below.

1965

21514 to NF

1967

21408, 21411, 21426, 21430/3/8/9, 21442, 21452, 21464, 21470/9, 21486/8, 21490, 21503, 21531/9, 21541/7/8, 21555/9, 21569, 21571/3/6/9, 21580/2/5, 21595/8, 21607/8, 21625, 21636/8, 21663/9, to NO

1968

21550, 21645 to NW

1969

21415/9, 21421/9, 21465/6, 21477, 21504/5, 21510, 21513, 21527, 21542, 21558, 21568, 21575, 21590, 21612/3/7, 21620/9, 21637 to NW

1971

21456, 21529, 21643 to NW

1972

21405, 21412, 21424, 21440, 21483, 21493/5, 21501/7, 21524, 21551, 21562, 21574, 21623, 21630, to HCN

1975

21536 written off

1976

21509 written off

1977

21403, 21627, 21641, 21667 written off

1979

21622 written back

1981

21401/6, 21484/9, 21497, 21528, 21540, 21586 written off

1982

21425, 21446, 21454/9, 21471, 21545, 21553, 21610/1 to NA

1983

21409, 21413/4, 21422, 21431/2/6, 21443/5/7/9, 21462/9, 21473, 21491/4/8/9, 21512, 21523/5, 21537, 21561/7, 21578, 21584/8, 21591, 21602/9, 21616, 21621, 21632-4, 21646/8 written off

1985

21437, 21476/8, 21502, 21532/5, 21544, 21554, 21615, 21653/5 written off

1986

21402, 21410/7/8, 21420/3, 21435, 21441/4, 21450/3/5/8, 21460/1/8, 21472/4, 21481/7, 21506/8, 21515-7, 21520/2/6, 21556, 21565, 21605/6, 21618/9, 21624/6/8, 21635/9, 21640/7/9, 21650/2/6, 21664/6/8 written off

1987

21404/7, 21427/8, 21434, 21463, 21480/2/5, 21492, 21511/9, 21521, 21530/3/4/8, 21543/9, 21552, 21563/6, 21572/7, 21581/3/9, 21593/4/6/9, 21600/1/3/4, 21614, 21622, 21631, 21644, 21651/4/8, 21660/5, 21670 written off

1988

21560, 21587 written off

1989

21451 written off

1991

21416, 21475 written off