This category only covers low-sided, gondola-style, coal, ore, or slag side-dumping cars. There isn't much prototype information available on the Web, and very few models were made in S.
Below are links to the various reports that show all of the S-scale dump cars ever produced. Click whichever report gets you to the information that wish to find. The bottom of this page has additional references that might be of interest.
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These definitions, in alphabetical order, may clarify some of the terms used in the reports linked to above: