Built between 1961 and 1965 for Associated Portland Cement Manufacturers (APCM), the Cemflo/PCV wagons are probably best known for their use on trains of Blue Circle cement from Cliffe, in Kent, to Uddingston on the outskirts of Glasgow. During their working lives, they also supplied a number of other locations, including Aberdeen, Dewsbury, Dundee, Grangemouth, Sunderland, and Widnes. The last Cemflo/PCV wagons were withdrawn from service in mid-1988.

Several types of locomotives were observed hauling Cemflos during their time in service, including class 25s, class 26s, class 27s, class 31s, class 33s, class 37s, class 40s, class 45s, class 47s… even Black 5s, Jubilees, 9Fs and A4s!