Hi Davidje,
I will go there too (well, not exactly an english presence though)
It's my first time but I know a couple of people who participate for a long time. It's the biggest meeting on the continent, held in the centre of the city and covers all aspects of 'steam'.
Some pics from the past are here:
http://www.feflo.de/bilder.php?q=/2_...0/08_dordrecht
http://www.feflo.de/bilder.php?q=/01...2/25_dordrecht
cheers
chris