Reading through the Little Rock Line blog where Allen has been busy weathering U33B's, I ran across his link to Thomas Klimoski's Georgia Northeastern blog. Thomas's excellent layout is often posted on YouTube. You'll find the link to the Georgia Northeastern blog in my Blogs of Interest side-bar.
Don't really get to see too many black boxcars. Around here at least it seems any black cars are tank cars or a few carbon black cars for the local Cabot Carbon plant. I never see any black boxcars, so this photo taken by Collin Reinhart in Altoona, Pa. a week ago today kind of caught my eye...
https://www.railcarphotos.com/PhotoDetails.php?PhotoID=129991
This is an Evans Railcar 50 footer, and I guess we see it in the photo as being black, but I suppose that really it's mostly grey. Maybe it's faded to grey from black. Notice the white portion at the end portions of the side sill. If you wanted to model it (I'd kind of like to), ExactRail makes or made the correct car, but not in this colour scheme, so repainting would be required. I'm not quite sure how to come up with the red placard for the sides.
And downstairs here on my railroad, I got the just tiniest bit accomplished when I found and added a set of Details West mu hoses to my CN/GTW SD40 #5931.