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Hello All, I am new to the hobby and could use some guidance. I am running the Atlas #27 Transbay Interwoven track layout on an all DCC system.  I followed the directions as layed out in the Atlas book I used - installing only the double-blocks as directed by my LHS.  I have the track installed, however I am routinely receiving the SVDA - short code on my Prodigy Express unit.  I believe I need to run two AR1 units in this double reversing setup...but am unfamiliar with the concepts of electricity and wiring.  Basically, I know how to turn on the light switch and viola, the light comes on...Please advise as to how this design should be wired, including the AR1 lead placement.  As I am new to the hobby, please be sensitive to making any assumptions of knowledge or understanding of the hobby vernacular. Thank you and I look forward to the insight offered by the forum.
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