Hopper Car Parts Diagram
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Patent US3677196 - Covered hopper car - Google Patents
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Patent US4362111 - Covered hopper car - Google Patents
Intermediate Hopper
Peckforton Light Railway: How I constructed a loading hopper
PD Hoppers – Everest Railcar Services
Patent US6774318 - Removable material hopper assembly and method of
Patent US5259322 - Five unit articulated covered hopper car - Google
Patent US5433559 - Pressurized hopper car - Google Patents