I didn't realize that the 36' boxcar question would generate several deep-dives/answers.
My dive/answer is much shallower: Yes.
36" cars did exist, some lasted a while, they would be an interesting contrast to 40-footers; I have a 36' Atlas reefer, and it has the double-whammy of being both accurate and cute. Yes, cute. Scale but still 027 size, kinda.