Model Railroading > 3-rail layout wiring

Anyone have a source for info on wiring a 3-rail layout, non DCC? I am looking for examples of a layout with electrical blocks and at least two cabs for multiple train operation. Done it in HO, but not sure what to expect for 3-rail.

I have a book titled "Operating O and O-27 Trains" which I have found to be very helpful. I bought it at my local hobby shop in 1995. It is ISBN No. 0-934580-02-2, published by MDK, Inc. (K-Line). I don't know if it is still in print. Walthers may have it in stock. Kalmbach may also have a similar book. I have a fairly large 3-rail O-gauge layout, and I think you will find that wiring 3-rail is much easier than 2-rail.
Bill Pyper
Salem, OR