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Paul, Thanks for your help. I'll keep digging. I suspected the home-distant signal relationship but I wanted more than just my thinking on this one. The upper vs. lower motion is more strange to me. Also, I notice that some semaphore blades are painted red and others black. I also recall that some blades are forked which means something special as well. They are no more complicated than our illuminated signals. You just have to dig to find out about the rules. Thanks again. - Ed
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