Hi
I'm from the UK.
Have you ever thought of building a signal system for a model train / rail road.
Something that only lets trains through sections of track if the lights are green. Lights only green if nothing else on that section. Would need to work with having multiple tracks on a board that may join up. Like going from twin track to single track. Would like an option to turn all lights to stop (red) all trains from leaving the section.
Please ask if you require any more information.
Thanks
Steve