British Railways built a single batch of 150 wagons for anhydrite from Long Meg Quarry on the Settle and Carlisle. They well known to enthusiasts and were vacuum brake. Less well known is that some 'escaped' to work from Wellingborough in the mid 1970s. The N gauge society makes a kit available for these. NOTE – These photographs are low quality scans and may not print well. I will sustitute rescans for larger prints but this may delay production.