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Reply to "The RR Track Signal Control Board Project"

It's obvious that you would want to include signal aspects for CLEAR, APPROACH, and STOP. But I would suggest, since we're already talking about grade crossing flashers, that this device be able to represent aspects that include flashing as well.

Flashing GREEN for LIMITED CLEAR or whatever you want to call it. Flashing YELLOW for MEDIUM APPROACH as was used by Southern Pacific. And Flashing RED could be a RESTRICTING aspect. Your railroad may use different terminology for the various aspects.

Another thought is a signal that acts as a Control Point (CP) at the start of a siding. In that case, you would want to have a 3 aspect signal head over a 2 aspect head indicating a straight or diverging route for the switch into the siding. Probably GREEN for straight and RED for the siding.

I agree that you want to keep the Signal Controller separate from Block Detection and Switch Orientation devices. For the Signal Controller, it all boils down to inputs driving the signal aspects.

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