Funny, testing car weights with curves, know what you mean. Thanks for the answers. I use FasTrak too.
One more question, when I asked about the arc degree, another way to put that would be: each full curve section of O48 is 30 degrees and O60 is 22.5 degrees per piece. So I'm trying to get an idea of how long the O48 and O60 curved sections are in the 6% grade. Any chance you might have a SCARM file of your layout?