Hi Jerry,
I started replying earlier today and got "sidetracked" with a music store customer and a train guy from Hammondsport, NY.
Your information is very helpful, since my 11.5 foot curve diameter will certainly hang out as much, and with about a 4.5 inch engine width, I need to make sure I can clear the posts. I am going back to my ANY RAIL drawing and putting in the posts and adjusting as needed to try to get a 6 inch separation to be safe.
Best Regards and Thanks,
Mike