VHGY
The VHGY class are the result of the 1979 recoding of GJF_. At 1979 the number was 21 - 350.
Thirty new hoppers were built during 1979, VHGY 351-380.
VHGF
From the late 1980's, the last letter 'Y' was replaced by 'F'. The wagons were recoded to VHGF. It had been found that the interpretation of the letter 'Y' had been incorrect resulting in the change to 'F'.
With the conversion of some wheat lines to standard gauge in the late 1990's, many VHGF wagons were converted to VHGX. Numbers are not known but it appears that the wagons are not part of a number block.