Was reading the Australian_N_Scale Yahoo group when 'Mark' made a post regarding downloadable containers. Now Lambing Flat has no need of containers, and never will have, but I'm a curious sort of fellow, so I went and had a look. What I found was a German language site aimed at ship modellers, but with a page of downloadable containers in various scales (including HO and N scale) to print out on a card, cut out and assemble. Having a couple of pieces of card handy, I printed a couple out and assembled them, which took about five minutes.
They would look pretty effective as 'background' at a container depot and would be a lot cheaper than buying scores of injection moulded containers. They could even be used on wagons, if one was so inclined.
These, (and many others) can be downloaded at: http://www.igshansa.de/igsorg.html (then go to the 'Download/English' page.
Amazing what is available on the net these days...