I am in the process of finishing an install to an Atlas U33C, and, instead of starting a new thread for that, I felt it appropriate to post it here since it is the same drive as the U30C I did a few years back. I changed things up a bit from what I did on the U30C. Here's what the U33C looks like.
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This was somewhat of a bear to do because before I could do anything I needed to change both of the motor's wires as well as the wires coming from the trucks as they were in terrible shape: chafed insulation and only one/two strands of copper filament soldered to the motor contacts.

I used an iPhone speaker and put that towards the front. The LM-3S is located back under the rear radiator. It's a bit of a tight fit there vertically, but, it works.
You can also see that I used a length of PCB board to make all of the wiring connections.

I also used warm-white 3528 SMDs that I got off of eBay. I like the color of them as it looks spot-on for the 1980.

May want to call Nix Trains - they make the DCC decoder buddy C/Bs ... probably could assist you.

https://nixtrainz.com/

Don't let the number of views fool you, for some time now our forum has been getting constantly hit by bots, the spammer kind trying to register and scrapers, which I suspect at the height of the bots visiting were for the AI companies to train their AI.

Just for some quick stats, today we had to reject 5 signups that bots successfully answered the signup questions to, and at the height of the bot visits two weeks ago we had 4463 "guests" online.at once. Of the 46023 views on this topic right now I'd suggest less than 50 were made by humans, and less than half of that were by members of this group.

- Tim

My plan is to set up several power districts, 4 districts, use 4 Pwr-56s and 4 CB-1. All sections would be isolated with plastic rail joiners or use the old DC method with common ground and isolate the positive sides into blocks.

This will also allow me to use DC locos (separately of course). Using a DPDT switch to use dual power. Sim to a dcc/dc layout.

Will using multiple PWR56's be a problem ?

Thanks Bill, I couldn't remember the exact name, but you recalled the situation I was trying to rectify perfectly!