BR rebodied 21t hopper wagons with a simpler body design which had only 2 upright stanchions. Some of these used U channel and huck bolting, apparently at the same time that Shildon usually used welding construction. 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
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