Didn't MTH take over the Madison car tooling from Williams while it was being made at Samhongsa? (sic?) They came in those "Custom Trains" or something boxes.
That's where he got the Weaver E8 tooling with the big "eyebrows" over the windows too IIRC.
This history must go back quite a few years. I got back into the train hobby in the late 90s and don’t remember hearing of these acquisitions.