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Reply to "Lionel 151 semaphore"

Check your wiring.  Here is a link to a 1954 Lionel booklet that gave instructions on most of their accessories.  The #151 Semaphore is on page 16.  Your bulb should be on constantly and when the signal is energized the arm moves down which places the other colored filter in front of the bulb - thus changing the color.  Good luck.   

https://slsprr.net/history/1954LionelTrainsAccess.pdf

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