The VZOF wagons are numbered 121, 123 and 174. They retain the earlier _E__ wagon numbers.
The wagons were converted from VOAA wagons, same numbers, about June 1990.
The VOAA wagons were fitted with cast bogies about 1981 and changed to roller bearing bogies on conversion. Only VOAA 174 had roller bearings fitted before conversion.
VOAA 174 was in departmental service during the mid 1980's.