Twenty-one WFX class standard gauge flat wagons (WFX30335-30355) were temporarily converted to run on narrow gauge bogies and reclassified QWF in 1970. They were reconverted to class WFX as the standard gauge opened in 1972 (30335-7/9, 30340-2/4-9, 30350/1/3-5) and 1973 (30338, 30343, 30352).

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