Years ago, after discovering one of these Cotton Belt USRA Clone DS double door rebuilds in the Henderson box car book, I made a scale drawing. The cars seem to have been in the 46000 series of the SSW. I have an HO model I built of this car about 23 years ago which I would like to update. I never knew what power brake brand was used. I used a Ajax back then.
The rebuilds besides reusing the original ends (with mods) also reused the fishbelly USRA style of underframe. With a modified rectangular panel roof and noticeable side sill mods, I think this is a fine looking rebuilt car. The pair of pre-war Youngstown doors and riveted sides work well together for coolness.
I read , perhaps in the caption, that these cars after rebuilding were used for Blue Bird bus company seats and also for general service.
I see from this picture grabbed from Ebay that at least two methods were used in splicing the ends for increased height. My model has the center section with 3 Murphy ribs, as shown on SSW 46029 to the left.
Anyhow, hearing from some gifted person on what brake equipment was used is appreciated in advance.