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The PRR used "position lights"....which meant all lights where yellow, on a set of seven lights arranged with a hexagon around the "middle light"......but a problem was that if lights failed.....you could get very different signals. Amtrak replaced most of these with color-position, taking out the central bulb and replacing the hexagon lamps with ones that could be three colors. <br /> <br />Red, yellow, and green are universal colors.....don't know if any railroad uses any others? (although in the London Underground "Lunar White" is also used.....but what about in North America?)
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