Brilliant Doug!
I'm intending to have a go at weathering my LGB tippers. This has given me plenty of food for thought. I had thought of using that artificial rust stuff - but this looks just as good, if not better! I assume you wiped off the 'rust' in places to get the original paintwork to show through.
I like these feldbahn tipplers too. Much more elegant and realistic than the LGB V ore wagons.