The 2 ton wagons had very long careers - being introduced in 1957 and still in use in the 60s. There were many repairs carried out overt he years and one common theme was the replacement of the original T beam spines with new ones made from lengths of old rail. This necessitated new couplings and a rejig of some of the underframe bracing.
This model accurately reflects these changes. Use Axleboxes AB01
, and couplings CPL07. The couplings will need to be attached with M1 or 14BA hex head nuts and bolts. Alternateively see FRC11 for a model with integral functional couplings.