Hey Ken, which layout were you asking about inner and outer loops? The one I posted is not mine, but I'm pretty sure it's O36 inside loop and O42 outer loop since it looks to be all Realtrax. I found it on this page...
http://www.mini-things.com/layout.html
Robert, it appears ken is right, about the 031/042 loops, Realtrax does not offer an 036 curve.
Doug