UP has been working to replace all the block signals out in the desert. However, due to the low levels of traffic...particularly the low levels of UP traffic...the replacement has been going very slowly. That actually allows for shots like this to still be possible! Not only is the original Rio Grande intermediate signal still being used here, but it still has its lunar indication! Rio Grande used this on uphill climbs, providing for a restricting signal that would allow trains climbing a grade to proceed by the intermediate without stopping. A BNSF Provo-Denver has just passed by, activating the restricting aspect.
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