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Dizzy's wanderings & wonderings: wondering about a r.r. icon.3d train car .
Diagram of covered hopper car by the Gouvernement du Canada
Drawings from the Society’s archives and publications – The Santa Fe
Patent US7735426 - Hopper cars with one or more discharge control
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Dizzy's Wanderings & Wonderings: Wondering About a R.R. Icon.
Patent US5259322 - Five unit articulated covered hopper car - Google