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Next question [?] <br /> <br />We just got over a power outage. It lasted around an hour, no big deal. During the outage I heard the train horn at a nearby crossing that has lights, bell, and arms. My question is this. During a power outage is there a backup battery for the crossing lights, bell and arms [?] Do the crossing usually get their power from the local source or from batteries in the nearby metal shed [?] Years ago I remember seeing a put-put car stop near a different shed and the signal maintainer pour acid into a large glass container. <br /> <br />Now same idea but different angle. Do the defect detectors get their power from the local source or batteries in a shed [?]
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