Thrall 5750 cubic foot* carbon black covered hoppers manufactured between September 1968 and 1989 (and beyond) feature a boxy ribbed carbody with numerous roof hatches, three hoppers and sampling spigots on the carbody sides for each compartment. The cars can be broken down into seven variants with certain distinguishing characteristics.
September and December 1968
No carlines (roof ribs) over the partitions
March through June 1970
Carlines added to partitions
Side stakes at bolster changed from 3" column to 6" channel
Sampling spigots changed to round style and running board width increased to 24 inches
April through July 1975
End stakes changed from zee to column
June through November 1977
Carlines are fewer and a lower profile (internal?); 6-1/4" wide side stakes
December 1979 through May 1989 and beyond
Roof design returns to earlier version, side stakes over partitions
*Some 4727 cubic foot cars were converted to 5750 cubic foot models, but they are not covered here.
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