While driving along the ex-SP Sunset Route yesterday between Yuma and Tucson, I observed at least a hundred miles of single track still protected by searchlight signals. They're well maintained and have a pole line still in place (1 or 2 cross arms). These are mounted on instrument cases that obviously were originally for lower quadrant semaphores. They merely shortened the masts when they installed CTC and the searchlights.
No telling how much longer they'll be there. They are surely on UPRR's hit list
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