Charles Greene wrote: "No, Tichy kit #4040 isn't the one I'm referencing. That does, indeed, have low sides. The one I have in mind had 4 ft.-high sides like the prototype built in great numbers and used by many railroads. <<snip>> Anybody know of a current kit for that common-design gondola?"
That sounds like the low-sided gon done in resin by Funaro and offered in injection-molded plastic by Ertl (though "common-design gon with great numbers and used by many railroads" doesn't really fit any low sided gon). Scan of Ertl catalog pulled from the HO Seeker website.