For edp458

This is a good explanation of how the e-unit works (the relay looking structure you mentioned).
https://dfarq.homeip.net/how-does-a-lionel-e-unit-work/

Sounds like you're new to this. Below is a link to an old Popular Science reference article from 1964 that gives a good basic explanation of some parts and some fixes for simple problems. This will give you a starting point if you run into additional issues.
https://archive.org/details/PopularScienceReferenceLibrary15CommonRepairsForElectricTrains1964/page/n5

This is an EXCELLENT piece of software for something in such an early stage of development.

Couple of things I'd like to see is the ability to save 3d user created figures into an Object library or as individual object. And make a library or object someone else creates importable. That would allow users to create objects for SCARM that could be shared.

I just created a figure for a lionel 497 coaling station. Others would probably like to have it.

I also have some old .3ds models from the late 90's and early 2000's. An importer / converter for such objects would also be great.