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I also suspect the second aspect which might be displayed by the bottom signal head here would be either yellow or lunar, but for different reasons. Under the block and interlocking signal rules traditionally used by UP and several other U.S. roads, a red-over-red-over-yellow or a red-over-red-over-lunar aspect indicates "restricting." "Restricting" means "proceed prepared to stop short of train, engine, obstruction, or switch not properly lined, looking out for broken rail or anything that may require the speed of a train or engine to be reduced, but not exceeding 20 MPH." A restricting indication might apply to either the normal or the diverging route at a junction. The alternate indication on the lower head probably wouldn't be green, but not for the reason previously claimed. Since this signal can display a green aspect on the middle signal head, it can indicate "divering clear" with a red-over-green-over-red aspect. It wouldn't make much sense to have a green as the lower aspect, since red-over-red-over-green would just be another way of indicating "diverging clear" and wouldn't permit the display of "restricting". "Diverging clear" in advance of a junction or crossover is a very commonly-seen signal indication--it is hardly a rarity. "Diverging clear" means "proceed on diverging route at prescribed speed." The employee timetable or special instructions will set the speed for the normal and diverging routes at the particular location.
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