If you're a DIYer who enjoys model trains and hobbiest level electronics, and would like to convert your model train engines to radio control and battery power, then this material is for you.
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Code and other material here was created by me to convert my O scale engines to radio control and battery power. Seen above is a 1999 MTH NW-2 (https://www.mthtrains.com/products/30-2157-1), one of my smaller engines, with control logic I created and LiPo battery power that can run the engine for hours. With this accomplishment I'm certain the remainder of my O scale engines can be converted similarly. There's enough information here to support your doing the same kind of conversions: all of my supporting code, KiCAD design files for a custom PCB, and FreeCAD design files for 3D printed parts.
An article on this effort will appear in an upcoming issue of Model Railroader Magazine (https://www.trains.com/mrr/) in early 2026.
2025 12 05: A reasonably detailed instruction manual for the material here will follow soon.