VOJX 1 was photographed in 1989 and about 1990 it was relettered to VOJF.
Between 1990 and 1994, fourteen bogie open wagons were reclassed to VOJF. The traffic was for the transportation of gypsum from Nowingi to Gheringhap.
The numbers known to date are: 1 - 4, 10, 13, 14, 16, 17, 19 - 22, 26, 27, 29 - 34. This suggest that more wagons are running but no information has been collected or a conversion project was started but halted.