Between 1989 and 1998 many frames from HEA hopper wagons were used for newly constructed box open mineral wagons. They were built at several different works, and were introduced in various liveries, such as BR coal sector, Mainline and EWS. Some duplication as I saw the same rake at Tees in 1999 and Healey Mills in 2001. Many were cut down to become MFA, possibly c2008 https://paulbartlett.zenfolio.com/mfa