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I don't believe I ever saw a flashing green in my 30 yrs of RR service. I have seen a lot of flashing yellows which means that the next signal will be a solid yellow and the next red, so you better slow down your train. Possibly a flashing green is a signal malfunction or it might mean that the next signal will be a flashing yellow. I don't really know. BTW, was there possibly another light associated with the flashing green? Like a solid red or solid yellow? That would indicate that a diverging route was imminent.
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