Randy, Yes, I've been at it for some time now. A clarification: In the above post I mentioned that 2 1/4" worked for radius of 23 7/8 and 26 1/8, but that for appearance sake 2 1/2" might be better. I was refering to the appearance of passenger cars passing each other. Although they clear on my setup, they look much too close. The clearance is about the thickness of shirt cardboard. You need to compromise a bit on the appearance of the trains passing each other and the appearance of the track when no train is in the scene. Prototype track would typically be a little less than the 2" generally accepted. Using 2 1/2" starts being noticably wide, IMHO. Of course the best advise is to use the largest possible radius, particularly on double track mains. Obviously the track spacing issue is non-existant for single track, where tighter radius won't be as noticable.
Gary