This class of ten wagons was the final variant of the flat wagons built around the standard 42'-0" post-war underframe. It came into being as the result of converting QCE and QCF class wagons, originally for containers for potatoes. Later any container traffic was carried. The brief history of the class is tabulated below:

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1980	23595, 23626, 23640, 23644, 23657, 23665 ex QCE
1981	23582 ex QCF
1982	23649 ex QCE 23580 ex QCF
1983	23596 ex QCE
1987	23640 to QK
1990	23595 written off
1992	23582, 23596, 23644, 23649, 23657 written off
1993	23580, 23626, 23640, 23665 written off