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Thanks for your responses! I wish I were able to draw a picture of the Grand Valley track plan. Following a review of the above responses I still have concerns. I suspect there is a way to verbally describe the plan...a folded dog bone or an expanded figure eight, whatever...the plan as provided by Atlas suggests only one block. When I connect two sections of the plan (and introduce the reversing loop) there must be a reversal of polarity...a reversal of polarity of the entire block. I think I understand thus far. But what happens if another locomotive is active in the block at the time of reversal? Does it reverse direction?, or does it ignore the polarity reversal and continue in the original direction? I was planning on track gaps in only one location, that being between the two turnouts that create the reversing loop.
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