The basic information that these DT&I gons were BLACK came from Jim Hediger at Model Railroader, whose father worked for DT&I at a time also when son JIm was pretty alert to that railroad's equipment.
I certainly will not argue with documented primary information that they were in fact delivered in BCR. So…either memory is fallible, or…they were repainted black early in life.
But, just why would a railroad repaint a lowly gondola so early in life?
Denny S. Anspach MD