as most signals in the east don't indicate route , they indicate track speed , green = clear to go timetable speed , yellow is approach prepared to stop at next signal and of course red is stop and there are many combinations of the multiple heads on each signal. the branch would just need a single head and the mains would need a double for each track facing the crossover switches. some western roads use signals that indicate route Normal or Diverging but these don't directly indicate switch position only that the route is clear. big yards sometimes have switch position indicators that look like small dwarf signals. duplicating even the simplest of prototype systems would be a hobby in itself. its your railroad set them up the way you want. I am a retired railroader and wanted a prototype system but it will never happen as it's a massive project, I am happy with my Z stuff signals changing as the train passes.
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