This is a TT120 scale model of an 8-shoe LMS style 12' wheelbase 21'6" ohs wagon chassis. You may want to add a vacuum cylinder and a cross-shaft between the v-hangers. If you want to fit NEM couplers to the wagon, the coupler pocket sprue I have uploaded will provide you with 8 of them (enough for 4 wagons) to slide in one each end of the chassis before fitting a wagon body and headstocks over the top, which should keep them in place. Don't glue the body on too hard, in case you need to change a broken pocket.