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Railings are sets of bars used to enclose space, and are common features in landscaping. Timber railings have been used since ancient times, and may have been the means by which the first yards and gardens were enclosed. Today's landscapers often use cast iron and wrought iron for railings. In the old days, wrought iron, which essentially means “worked iron,” was made by heating iron to red-hot in a furnace, and then hammering it on an anvil. This was a process by which the material was strengthened and impurities were driven out. Today's wrought iron is produced in mills. Cast iron railings are made by heating the metal until it becomes liquid, and then pouring the molten iron into moulds that are allowed to set.
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