ciphernaut

Another option is to wire a red and a white led in opposite polarity. So when the train is running in the other direction the other color should come on.

Also planning for my layout, several independent control systems. Trains are built to run autonomously and behave based on colours they detect. This removes errors based on external connectivity and related latency issues. Use RFID for external guidance. Can hack pup to recharge from metals rails for longer running time. Tracks are split into sections and one or more controllers determines which train needs to be in which section. Under-track switching of colours to halt trains until next section is clear and/or track is switched to correct path. This would be an Arduino or possible rpi solution.

@JopieK Agreed. I've started a document to scope various use case requirement to get a clearer view as to what platforms out there can be leveraged. Feel free to add your setup / use cases. https://docs.google.com/document/d/1FIe7-u3s2GsN8l3kyhp2Tf9ReoExb7_D5aUxJltgXCI/edit?usp=sharing

Nice. what hardware and components are you using? are you using mqtt and node-red to drive it? There seem to be a quiet a few home automation platforms like tasmota and esp-easy that allow setting up devices post-install but vary in what hardware is available in stable releases, including which rfid platform is available.