N and W Hopper Car ( secondfig )27 Hopper 3 Wiring Diagram - Wiring Database 2020The stressed state of the section of an articulated hopper carNWHS NW-B17624-NW Mech DwgPatent US3187684 - Rapid discharge hopper car - Google Patentsfastline simulation: HEA Hopper Conversions: MFA RenderPatent US5259322 - Five unit articulated covered hopper car - GooglePatent US3486241 - Controlled aeration system for a covered hopperSchematic diagram of hopper | Download Scientific DiagramPD Hoppers – Everest Railcar ServicesPatent US6067912 - Automated discharge system for hopper car - Google