The Coalbrookdale Museums tell the fascinating story of how the local methods of iron production developed over the centuries to enable the large scale manufacture of metal tools, machinery & vehicles used in every aspect of domestic and business life all over the world. It was here that attempts to produce iron in large quatities were tried & tested and the first Darby blast furnace was constructed in 1709.
The railway was built through the factory buildings at a later date. Iron production involves the firing of prepared amounts of linestone, iron ore & coke (semi-burnt coal) in a furnace at exceptionally high temperatures of 1,000+ degrees centigrade, high enough to melt the ore. The resulting melted pig iron flows from the bottom of the furnace and is cooled in sand moulds.
This is the original furnace. Imagine it twice the height. Two men, working in 12 hour shifts, would have continuously filled the furnace from the top with the three elements, thus keeping the furnace going 24 hours a day and 7 days a week because if it went out & cooled down the furnace would crack. Another man was responsible for letting the pig iron flow from the hole in the bottom into an arrangement of channels that reminded folk of a litter of piglets feeding from the udders of their mother.
To keep the temperature up a huge water wheel powered two enormous bellows which blasted a continuous stream of hot air across the bottom of the furnace.
The original buildings that made up the iron works have been converted into a cafe and museum displays but the feel of the origial blast furnaces remains.