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Patent US5433559 - Pressurized hopper car - Google Patents

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PD Hoppers – Everest Railcar Services
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Patent US6067912 - Automated discharge system for hopper car - Google

Cylindrical Covered Hopper

Cylindrical Covered Hopper

Equipment for internal and external cleaning of hopper cars

Equipment for internal and external cleaning of hopper cars

Patent US5433559 - Pressurized hopper car - Google Patents

Patent US5433559 - Pressurized hopper car - Google Patents

Patent US5259322 - Five unit articulated covered hopper car - Google

Patent US5259322 - Five unit articulated covered hopper car - Google

Virginia Beach Fire Academy: Hopper Car | HAZMAT

Virginia Beach Fire Academy: Hopper Car | HAZMAT

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Patent US6774318 - Removable material hopper assembly and method of

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Modeling Hopper Cars

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Patent US2401407 - Hopper bottom car and trailer - Google Patents