That sounds very interesting. Generally I can reproduce every light signal. I wouldn't use semaphores though, simply to avoid confusion for those, who don't know what each signal means.
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It will need some instructions to make for users. It be so fine to have chance to change loco from electric to diesel. If i will make route with part without electricity, will be great to change loco for my train. So i will prepare for you list of lights signals in Poland for start. After that we will think about another forms of that which you can find in Poland. I have a question about ETCS. Do you want add it to this simulator?