Hi Shed,   Great story about your days working these trains! We were keen to add Gypsum to our lineup as nobody has done a gypsum container train in 4mm before, and although the PFAs will be synonymous with coal containers and now nuclear traffic, the did spend a number of years working gypsum as you say, with a nice big type 5 up front.    We produced this handy formation guide if anyone is looking for visual inspiration or guidance when purchasing PFAs.