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Thanks for the input - I see now the error of my ways [;)] Daveklepper, my favorite signal aspect system is the old standard - "Red is a Signal of Danger and signifies Stop; Green is a Signal of Caution; White is a Signal of Safety and signifies Proceed" - naturally displayed by mechanical lower-quadrant semaphores and Hall Disk signals! However, my favorite signal aspect system ever is Santa Fe's upper quadrant semaphore aspects. They only had five aspects: Clear, Approach, Restricting, Stop & Proceed, and Stop. Block signals displayed Clear, Approach and Stop & Proceed; interlocking signals displayed Clear, Restricting, and Stop. The Restricting aspect not only served the same purpose as an Approach aspect, but also signaled diverging routes as well - meaning that any given signal on the line, no matter its function, would require only ONE arm! The arms, incidentally, were not painted the traditional colors, but solid black or white, for maximum visibility against their background. They were all the same shape, too - the number plate (or lack thereof) being the distinguishing factor. Truly simple and economical, if not aesthetic. My favorite current paint scheme is BNSF's Great Pumpkin; it's nice to see a traditional American splash of color on the rails again.
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