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Patent US20080066642 - Rail road hopper car fittings and method ofPatent US20100132587 - Rail road hopper car ridge fittings - Google PatentsPatent US20100132587 - Rail road hopper car ridge fittings - Google PatentsPatent US7080598 - Railway hopper car with longitudinal dischargePatent US4362111 - Covered hopper car - Google PatentsPatent US4696237 - Multiple hopper rail car with offset vertical weldPatent US20100132587 - Rail road hopper car ridge fittings - Google PatentsPWRS Pacific Western Rail SystemsPatent US20100319570 - Rail road hopper car structure - Google PatentsDrawings from the Society’s archives and publications – The Santa FePressure Differential Covered Hoppers – Everest Railcar Services