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Signals
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The New York Central signals I remember had three lights, in a triangular arrangement, mounted on a circular target. Oregon Rail Systems makes them as their part #116, and part #134 (2 signal heads on one mast). Tomar Industries also makes them as their part #H-855, and part #H-865 (2 signal heads on one mast). <br /> <br />Two signal heads on one mast will be appropriate for interlocking and Centralized Traffic Control applications. They can provide a greater number of signal aspects than just one head. For example, green-over-red may indicate "Clear", i.e., "Proceed ", and red-over-green may indicate "Diverging Clear", i.e., "Proceed on diverging route at prescribed speed." <br /> <br />The track arrangements you desribe for your layout will permit conflicting movements of trains which could result in collisions at crossings or at turnouts. So what you will be doing is providing for a form of "interlocking" to prevent such collisions. The signals described above would be a good match for your requirements. <br /> <br />
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