Guys-- I just completed a comparison of an ESE coach car from the new set #2 (2565) to an earlier coach of this type (2566). I happened to have gotten the earlier 2-car add-on pair to check on some cross-over design I was doing, as well as minimum radius issue.
So I coupled the new coach 2565 to the earlier coach 2566, in the PRR interlocking mockup. As some have suggested, the new car was 1/8-inch lower than the earlier (by 6 scale inches). The overall height of the new car was 3-1/2 inches over top of rail (=scale 14'-0" which is exactly correct). The other few varied cars on the mockup were not quite this accurate, altho close, and I have still others not present.
I then noticed that the full diaphragms were not parallel. The newer car 2565 was higher on its free end. It has two different height trucks (the pivot height arms differ). Having a life, I reversed the new car and moved on. It appears to be a transition car. Your mileage may vary. --Frank [Edit grammar: others (plural), car (not plural).]