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Re: PHOTOS: POSITION LIGHT LAST CALL

Posted by George Foelschow on Sat Sep 21 10:11:34 2019, in response to PHOTOS: POSITION LIGHT LAST CALL, posted by Jersey Mike on Fri Sep 20 22:57:00 2019.

I appreciate your interest in and study of railroad signals. I would imagine that wayside signals serve as backup to cab signals. Are cab signals driven by track circuits and/or are satellites ever employed to determine a locomotive's physical position? I can see the wisdom of using duplicate systems at interlocking plants.

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