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PD Hoppers – Everest Railcar Services
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Patent us4362111
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PD Hoppers – Everest Railcar Services
Covered Hopper Rail Car - FrieghtCar America
Dizzy's Wanderings & Wonderings: Wondering About a R.R. Icon.
Patent US4362111 - Covered hopper car - Google Patents
3D covered hopper car railroad - TurboSquid 1530704
Covered Hopper Railcars for Lease – MRC : MRC
Patent US3664270 - Covered hopper car with hatch cover means - Google