In 1966 some surplus _AV_ cars were converted for exhibition and trade trains. The interiors were gutted and the outsides of the car covered with aluminium cladding.
Four AV cars were converted in 1966 and two _BV_ cars done in 1968. The car numbers were 1 - 6.
When not in use the cars were stored at Newport Workshops. Exhibition trains were generally run about every two years for different groups. By the late 1980's the cars were not used at all and were scrapped or sold.
_CV_ 2 was modified in later years as a power generator car for the train set.