Instead of using colors, use basic shapes maybe? Triangle, circle, diamond, etc. I would suggest the visualization be a toggle and also appear in map view kinda like electric grid and pollution. This would really only be used when building and once train signals become understood maybe not all So i ...

This might be far out of left field and I have no idea how difficult it would be to implement. As our computing options are getting more and more varied so do our input methods. I think controller support would probably be the hardest but Pen and Touch would might be easy? Pen and Touch would seem t...