I live only a couple of miles from the mainline track through Monument Valley between Denver and Colorado Springs. JUst across those tracks and right alongside is a house. This house has to belong to an old railroader becaus it has a resembalance of a yard tower built into the side facing onto the tracks, and the owner has two semaphore signals flanking his driveway, visible to both passers-by and the crews of the trains. These are fully lit and change constantly. My wife and I joke about whether he is in a good mode or a bad mood depending on the position of the arms and the color of the lights. Does anyone know of a site where I can find the meaning of the positions and lights? Each tower has three arm positions and three corresponding lights, Red, Yellow and Green. I'm curious to know what he is saying.