The Weedex train ( weed spraying ) tank wagons were classed _WA_. The two louvre vans for support ( chemicals, etc ) were _HD_ 247 and 248.
In 1988 the WA tank wagons, numbers 1 - 5, 7, 9 were relettered VZVA.
In 1989, HD 247, 248 were relettered to VZVA 247, 248.