I might suggest duplicating your layout, which is I believe O-36" in O-48". Read under one of your curves and verify it is O-36" . if so duplicate all in 48" but you'll need another transformer to keep it REAL simple.
Lionel has a GREAT Fastrack book that answers all these questions, well, does a good job of opening ones eyes anyway. CLICK HERE to go to the link then shop for it. I think I found mine for 20 bucks on Amazon.
Good Luck!
Hmmm, I was unable to make a working link, hmmmm try this;
http://www.lionel.com/Products/ProductFinder/ProductDetail.cfm?ProductNumber=6-24200&expandBranch=0&Keywords=Book&CategoryID=&RailLineID=&CatalogId=
You may have to add the equals sign, I dunno this software is ummm...FREAKING LOL
Chip
Building the Rock Ridge Railroad with the slowest construction crew west of the Pecos.