A fleet of vacuum train braked tipplers was dedicated to stone traffic from the Mendip quarries of Foster Yeoman and ARC through the 1970s and into the early 80s, trains being hauled by a range of locomotives including 31s, 33s, 37s, 47s and Westerns.
These high-capacity 4-wheel open wagons did not have doors, being designed for unloading by a tippler which inverted the wagon, emptying it into a receiving hopper. Overhead grab cranes, earth-mover diggers and even JCBs can also be used to unload these wagons, making them popular for bulk materials like iron ore, chalk, sand and roadstone.