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PD Hoppers – Everest Railcar Services
The stressed state of the section of an articulated hopper car
Patent US6067912 - Automated discharge system for hopper car - Google
N and W Hopper Car ( secondfig )
NWHS NW-B17624-NW Mech Dwg
Ambroid ACF Center Flow Hopper Car - [PDF Document]
Schematic diagram of hopper | Download Scientific Diagram
Patent US7735426 - Hopper cars with one or more discharge control