Just a quick note to dispel the superstition of thirteen 'posts', and show my bodged soldering of the wires to the control panel for the main 'East Yard' part of the layout.  Of course, one pair of power-input wires was too short, so I had to solder 6" extensions to reach the correct input socket.

The back of the panel:

The two isolation sections (Goods arrival and departure), with wires on the right of each track (away from the viewer):

I will fill the gaps with painted modelling clay in an attempt to make the holes less obvious.