There is a great little program called track maker or track builder not sure exactly what it is called. It's real easy to use, the menu at the top is like a box of slot car track, you just pick the bits you want and assemble the track. Looks quite professional when finished. I just did a search for it but came up with a load of model train layout programs. Try again when I get home, just can't remember where I found it. P.S. just found these try them out for now, not the one I was thinking of but the same idea
www.rcptrackbuilder.com or
www.trackbuilder.com