Visit www.njinternational.com, under O signals see #3003 a 3 lite upper quad scale semaphore. Also see the #8000 ServoMaster activation system which will give a realistic 3 position indication for the signal
I saw on their web site that a "Tortoise" slow motion switch machine can be hooked up to a semaphore. You might check their web site. http://www.circuitron.com/
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