The 1979 recoding for the _QR_ class was VOWA, where W was presumably 'wood' and 'A' indicated low speed of 45mph or 70km/hr.
The QR number group was 1 - 407 and VOWA numbers were scattered through this. Many QR wagons were out of service by 1979.
For the remaining wagons, recoding to VOWA removed the wagons from active freight service and placed them into sleeper traffic. Most wagons were also painted with a vertical green stripe to indicate the traffic. The stripe was on the right end door of each side, the height of the door and about 12" ( 30cm ) wide.