Behind the 'Planet' in my previous upload is the Power Hall building which contains various gas, steam and water powered engines. Many of these are working, as can be seen as I was shooting at around 1/10 second.
Techie stuff – see Exif
Single Raw images processed in Adobe Camera Raw, tweaked in Photomatix Pro and Elements 6
Thanks again to everyone for your votes & comments on my previous uploads, it really is appreciated and encouraging.