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This realistic-looking OO Gauge Semaphore has been modelled on a real British semaphore. It has a red/white ‘flag’ that tilts down by 45° and lights a green LED to signal an oncoming train to continue, or is horizontal with a red light, indicating it should stop. It’s made from parts that are relatively easy to obtain, although it requires some machine tools and experience to build. by Les Kerr ....