Finally have all the switches wired to the power panel and punched down into the connection blocks. Just mounted the terminal blocks for the power & serial data. Given all the talk about the DZ-2500 switch machines all grouped might be an issue if one malfunctions, I'm splitting them up into groups of three for power and serial data. This allows me to isolate small groups of switch machines for debugging if necessary. I'll also be tapping the three CSM2 boxes for serial data for six switch machines, and the final six will be driven from the SER2 serial output. That gives me four serial data sources to minimize the loading and also any possibility of one switch machine affecting the whole lot. The first two punch-down blocks are full, they have 24 switch machines routed to them. The third block will be for expansion, I have six more switch machines for the future freight yard, and that leaves me with the possibility of adding another six after that before I run out of block space.
I feel I'm rounding the final turn and I can see the finish line for switch wiring in the distance! 
