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cablebridge did a great job describing signal operation, but I would like to add that depending on the method of operation, some signals can be just "block" signals, and do not govern the movement of trains, such as ABS with track warrents. they just protect trains. weras in a CTC system, the signal indication from a "control point" (signal) directly governs train movement. sounds like we all have figured signals out!!! <br />David
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