EWS ordered these high capacity open gondola wagons to replace older 4-wheel open wagons, the high sides allowing a wide range of commodities to be carried. Two types exist, 'outer' wagons equipped with standard buffers and drawgear and 'inner' wagons fitted with knuckle couplers only which can be coupled to class 66 locomotives.
The Graham Farish MBA and MOA Megabox wagons are fitted with NEM couplings. The wagon ends includes etched plates and the underside is fully detailed with pipe work and brake equipment.