The photo of the Brown or Oxide Gondola with Bulkheads is of SOO LINE 8485. This is one of the cars built in the 1950's. Those old gondolas were modified and repainted in the late 1960's or early 1970's. The open square tube frames are available through Walthers from Keystone Locomotive Works. It is cast metal. You could make your own version from styrene.
On the http://www.sooline.org/ in 2006 there was a notice that soon there will be a book covering all the Soo Line freight cars. They were looking for contributions. There were sample pages. They have already published photos that were better than most of my photos. Sometime in 2007 the SLHTS will publish the comprehensive freight car book.
Andrew
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If you hit reply and quote what was from the post, you will get the URL for the original photo.
This is a photo of a WC SOO LINE Bulkhead Gondola with green lettering. It is a slightly different design than others.