I can sort of picture that in my head but I’m not good at drawing the diagrams for it I will ‘play’ about with it once I get some modelling timeYes the number of diodes can get rapidly out of hand, an alternative is to use a microprocessor with plenty of pins as I did here signalling article but only if you are comfortable with programming.
As for the diode method imagine each point having an spco switch then wiring them in series exactly as your track diagram with the leftmost pole grounded, now each right hand tail wire will only be connected to ground (or - whatever you want to call it) when the points are set for that route. If you take each signal led pair, make them common anode with a single resistor to + then when you ground a signal wire the led will light. Now you arrange small diodes (eg 1N4148) with the anode to the signal wire and cathode to the point wire, best to make a cross hatched piece of paper to show each connection required. Where only a single signal is connected to a point wire no diode is required, the diodes prevent reverse feed conflicts when more than one point wire drives a signal.
I will attempt to draw one diagram and use different colour pens to represent the red green led feeds
I will put in where I think the diodes should go and also the direction
I have some signals that are wired the way you said
It has 2 inputs and only one out with a resistor attached to it
If I use diodes I think I can fathom out the wiring