These were built in vast numbers for private owners to move all types of bulk liquids by rail, including petroleum, oil, tar, paraffin and chemicals. Although there were many variations in design, they were a common sight on Britain’s railways from the early part of the 20th century. Typically, they would be built on a wooden-framed chassis with cross timbers for the metal tank to sit between, then braced with wire straps securing the tank to the chassis.