Just to let you know, the Woudagemaal opens up the new visitor center (including a new 3D movie) on October 4th. Because of that, the steam pumping station will be working on October 5th and 6th. It's only one or two times a year the station is actually working so if you haven't seen it, here's your chance!
I'll be there myself in the (late) morning of the 6th (hurray for working parttime)

http://www.woudagemaal.nl/