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TX Zephir, Thank you for your response as well as your patience as we move forward.I am running the double blocks as listed in the book (the LHS suggested that I did not need the single blocks as those were for DC).  Thus I followed the book as instructed (on the double blocks).An AR1 Unit is an Auto Reversing Unit from Digitrax.As for the wiring.  Each AR1 has 5 terminals.  I am directed to "Connect Track Power from Rail A and Rail B mainline to terminals 4 and 5 on the AR1 and then connect the wires from the reversing section to terminals 1 and 2 on the AR1."Does this mean that I use two connectors, X and Y as well as X' and Y', placing X and Y into terminals 4 and 5, then placing X' and Y' into 1 and 2?Also, do I place a second AR1 unit in a different area and do the same thing?Please advise. Thank you.
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