I wish I knew Brian. Each end is the same. The coupling seems the same amount into the pocket as the others but the angle of it is wrong. I will see tomorrow if it can be pulled out and reseated. Very small and fragile looking though . R-
It looks as though the coupling socket is too low. Is it possible that the end of the bogie with the socket is upside down. I realise the whole bogie can’t be upside.