These two massive low-pressure engines (supplied with steam at 5 pounds per square inch) were built for the Cromford and High Peak Railway by the Butterley Company of Codnor Park, Derbyshire, in 1829. They drove the winding gear which brought wagons up the Middleton Incline, which is 708 yards long with a gradient of 1 in 8.25. The engines are no longer worked by steam. For demonstration purposes they are powered by slightly compressed (3-6 lb. sq. in.) air from an electrically-powered blower.
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