Perhaps I should have added that the assignment of covered hoppers on the CGW began with the first series built in 1947.
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Don't know which road you are modeling but perhaps the CGW's experience might be useful to you.
The CGW had 210 covered hoppers but only 82 were assigned to cement service - 31 to Des Moines and 51 to Mason City, Iowa. Other covered hoppers were assigned to haul fertilizer, lime and livestock feed among other commodities. No cleaning was necessary for carrying different commodities because the cars always carried the same thing.