In 1974 fifteen WVX class vans were reclassified WVL after fitting with load dividing bars. A final van was reclassified in 1978 to bring the class total to 16. In 1987 they were all reclassified WBAX but there is some doubt over 30775, 30782, 30788 which may have been as late as 1989.

1974	30709, 30775, 30782, 30784, 30788, 30798, 30800, 30817, 30826, 30848, 30904, 30905, 30959, 30961, 30974 from WVX
1978	30898 from WVX
1987	WVL 30709, 30784, 30798, 30800, 30817, 30826, 30848, 30898, 30904, 30905, 30959, 30961, 30974 to WBAX WVL 30775 to WBAX date uncertain.
1988	WVL 30788 to WBAX
1989	WVL 30782 to WBAX