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Roundhouse 70804 HO Scale 34' Composite Coal Hopper Chesapeake & Ohio C&O 3 Pack RETools BlackZon 540102 Green Slyder 1/16Roundhouse 70804 HO Scale 34' Composite Coal Hopper Chesapeake & Ohio C&O 3 Pack The development of the hopper car went along with the development of automated handling of such commodities, with automated loading and unloading facilities. Open hopper cars are used for commodities such as coal, which can suffer exposure with less detrimental effect. Hopper cars have been used by railways worldwide whenever automated cargo handling has been desired. The