I recently went on a steam train trip which was a lot of fun. Before the trip we were walking around the shed where there were 9 or 10 strains in various states of refurbishment from having Dorris polishing the brass knobs (easy!) to Fred removing the wheels, pistons and bearings from an old beast of an engine. It was like porn heaven. Unfortunately we were short on time and I did not have a camera with me but you could spend hours in there talking to the guys, looking at all the different bits etc.
While it's not on the same scale, there was a lathe where they were finishing a drive wheel for a freight engine as well as various milling machines which would have filled your average home's bathroom
Day out anyone?