The bar is in the engine room of the Denver Mill complex where once stood a mighty Blackstone diesel engine that powered the mill. You can see some of the machinery which gives the bar its name. All beer is on gravity as is a fine selection of cider. Voted local cider pub of the year for 2019. There is no food available but there is a reciprocal agreement with the cafe next door that you can take beer into the cafe or food into the bar.