How do I wire this layout? 3 connected loops

I would suggest three independent running loops = 3 power districts. Cut the continuity between districts at the switches. Sounds like you are running fastrack but I wouldn't use terminal sections or those wall warts for this layout as they are weak. The lionchief stuff will easily run on any source of AC and as long as you have three sources of variable voltage supplies or a DCS TIU/Powermaster you can run the conventional stuff without issue as well.

Place insulating pins in the center rail where the red marks are. This will separate your three loops for conventional running. Hook up each loop to a different throttle on your transformer.

If you only want to run one train, it doesn't really matter, but I would wire this layout so each loop could have independent control.

If you want to run command, just turn those throttles up to full. You could still run your non-command equipped engines on their own loops with this scheme simultaneously. You will have to remove any conventional only engines from the layout if you need to run command, say crossing from either outer loop to the innermost to reverse. Adding an isolation track along the bottom of this plan, could really come in handy.

The track I am using is Fastrack.  The O-72 switches have the 1 3/8's fitter pieces.  From reading I think I am supposed to remove a wire from one of these?  That will allow me to run the trains from track to track?  I think?

LionelRookie1992 posted:

The track I am using is Fastrack.  The O-72 switches have the 1 3/8's fitter pieces.  From reading I think I am supposed to remove a wire from one of these?  That will allow me to run the trains from track to track?  I think?

 

Yes, you remove the jumper wire on 1 3/8 piece to turn it into an isolating section. You can also cut the wire in half and splice in a switch to this piece if you wanted to control power on a stub siding.

You've got three loops and two throttles on the Z4000. What's the plan for powering the third loop?

I have 2 CW-80's plus one CW40.  That was what I was originally going to use.  The Z4000 I bought many many years ago.

Simple - was to just use only the 3 CW's