Hi Tim

Have you considered a paper mill as a place to shunt kaolin hoppers?Although the trains are probably quite long at the clay pit, within a paper mill trains of only a few wagons would be moved around.
It would also give you the opportunity for closed wagons to take paper away, as well as incoming logs in stake wagons. (perhaps two sets, one full, one empty moving in opposite directions?)

http://www.bahnalltag.de/industrie/page-0001.html

http://img161.imagevenue.com/img.php?image=20113_albb2_122_975lo.JPG

Unfortunately the rest of the images from the original article on the Papierfabrik Albbruck http://www.drehscheibe-foren.de/foren/read.php?17,4621145 appear to have gone, but this video starts with a slideshow showing how the railway squeezes between the buildings.

http://www.youtube.com/watch?v=B73SPdS6W-M

I must admit that, living in Kent, I may be biased :-)

Brian