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I need some information about signals. In Kirkwood junction, MO, UP has a signall with three heads. The top two have the normal red, yellow, and green lights. The bottom head only has two lights, and one is red. Does anyone know what the other is? I'm guessing green, but I've never seen it light. I'm making a model of it, and would like it to be as prototypical as possible. Thanks in advance. <br /> <br />Ian
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