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Dear everyone, I would like to express my greatest gratitude for all you have taught me. I have learned more about how railroads operate in the past half hour reading your responses than I have learned in the past five years. However, what you have taught me has raised two new questions in my mind. Please forgive me if I missed something in what you have written that already answered these. Firstly, what if anything is the difference between ABS and manual blocks? Secondly, if TWC systems are designed to prevent lapping, why does TWC territory have signals? If I have misunderstood what you have been telling me, then I am quite sorry. Deeply grateful, Daniel
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