Michael;
There has been quite a debate about superelevation/banking on another site. Some folks were swearing by superelevation/banking; others were swearing at it. The information I took away from that debate was that in our relatively small scales, there is really no physical or operational advantage to superelevation/banking (at least if you run your trains under 150 scale mph!). Some folks just like the appearance of banked curves - or just “knowing it’s there.”
In the real world, I seem to remember reading that dispatchers had to avoid stopping any freight trains on that heavily-superelevated (6 inch) curved track. It was usually only used for high speed passenger traffic, but occasionally rerouting around track maintenance or derailments could bring freights onto that track. Stopped freight cars could actually fall off the track on such extreme superelevation.
Hope this helps,
David Meashey