What's really needed on cars like these is what's called "kinematic close couplings"; these are couplings that have 'draft gear mechanisms' that sense the curvature, and increase the car to car distance accordingly..<snip>..- MTH Euro freight cars [ and the Rheingold cars ] w/ scale wheels have them.
Interesting. I wonder if MTH makes them available in their parts dept. And, if so, could we adapt them to our passenger stock.