I don't currently have a diagram (and may never have anything as nice as CAPPilot's unless I learn some excellent new tricks). I am, however, in the midst of re-accomplishing portions of the layout and am roughly documenting it in the process. I will forward what I end up with once I have it captured and I hope that will be within the week or so. If you're going the MTH Z4000 route, I'm not sure what I can provide will be useful to you. My layout was started in the last century ( ;-) ) and things simply got cobbled into it. It's powered with the older "new" ZW and powerhouses, a post-war ZW, an SW, a 1033 and controlled with the original TMCC command base, powermasters, a Legacy command base, CAB-1s primarily and SC-1s....not very modern by today's standards.....and of course the newly added DCS items. But it works.