The Ram Brewery, now closed (in 2006), was home to a pair of magnificent Wentworth Woolf compound beam engines dating from 1835 and 1867. This is the younger (1867) engine.
Although they had not been used commercially for some years they were maintained in operable condition and I saw them run several times. They are listed and retained but I do not know whether they are accessible.
This younger engine is also an A frame, jet condensing, Woolf compound engine. It is rated at 20 horsepower (probably nominal) at 32 revolutions per minute on steam at 60 psi. Following a re-bore in 1970 the cylinders are – high pressure 12.25″ x c28.25″ and low pressure 20.25″ x 40″. The flywheel is 14′ 6″ diameter. This shows the cylinders and their short ‘D’ slide valves.