In 1976 BR introduced an airbraked coal hopper for domestic and industrial coal (unlike Merry-go-round hoppers they did not use specialist door operating gear). They were coded HBA and just a few were introduced with Bruninghaus suspension. Remarkably within a couple of years some were repainted in the new Speedlink livery. The Bruninghaus suspension was a success and conversion of the fleet was undertaken quickly during the early 1980s and these wagons were coded HEA. Drawing and information were published in Monk-Steel, David., Bartlett, Paul W. and Mann, Trevor, (1986) BR Air- braked Coal Hopper wagons. in Model Railway Constructor Annual 1987 pp 20 - 36 edited by Leigh, Chris. Also includes HSA, conversion to carry scrap steel.
Survivors lost there ladders from 2002-3. Scale drawings in: Monk-Steel, David (2022) An illustrated history of British Railways Hopper Wagons. HMRS publishing, Butterley Station, Derbys. 248 + iv pages ISBN 978 0 902835 42 9