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Hopper publications coveredPatent us6502518 Pwrs pacific western rail systemsCovered hopper train cars (22 units.
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Patent US6502518 - Converted multiple hopper rail car and method for
Type D Rapid Discharge System-Miner Enterprises Inc.
PWRS Pacific Western Rail Systems
Minneapolis & Northland Railroad Company Modeling: Northern Pacific
Patent US7080598 - Railway hopper car with longitudinal discharge
Patent US4362111 - Covered hopper car - Google Patents
PD Hoppers – Everest Railcar Services
Drawings from the Society’s archives and publications – The Santa Fe
PWRS Pacific Western Rail Systems
Covered Hopper Train Cars (22 Units - Approximately 632 metric tons