Update: I have a working loco!
I posted some final info in my Electronics thread, but I'll take some more photos and videos and post them here once I get the shell and decorations finished.
Here's the thread with the finished electrical system:
https://ogrforum.ogaugerr.com/...c/153463017389153551
I know it's somewhat common for lots of y'all to do these sorts of things. But I'm totally stoked that I learned how to bring a mechanically and electrically gutted locomotive to life! I now have a truly unique piece of MTH history.
Still need to find someone local who has a programming track so I can load the correct sound file. Or is there a way to load it without a TIU by plugging directly into something?
Thanks for all the help!