In 1975 eleven WGS and WGX class wagons were earmarked for nickel concentrate traffic and reclassified WGN. This was only temporary and they had all reverted to WGX by 1977.

1975	WGS 33022, 33047, 33052, 33077, 33099 to WGN WGX 33121, 33143, 33147, 33205,33207, 33212 to WGN
1976	WGN 33022, 33047, 33052, 33077, 33099,33121, 33143, 33147, 33205, 33207, 33212 to WGX WGX 33047 to WGN
1977	WGN 33047 to WGX