A set of intermediate signals sit quietly along Tennessee Pass. No power has been provided to these signals in nearly 18 years! The lower head on the signal to the right could only show a single color: lunar. When a westbound came past the signal (headed uphill), the upper head would turn red and the lower head (lunar) would illuminate. This would allow any following westbound to proceed past the red signal without stopping. At all other times, the lower head would remain dark.
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