automatic reversing loop mechanism

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BN Modeller
Hard to say, the picture has something going on that won't let me right click on it.
Looks like the loop at wind river may be where it's needed.
Is this DC or DCC?
I have used the Digitrax PM42 with a Zephyr. It will need to be adjusted through the LocoNet to work with the Zephyr, see the tech notes on DigiTrax web site.
What I don't like about the PM42 is the use of relays to switch the track polarity. They go click-click.

Tam Valley's Frog Juicer can do reversing and there are a couple of others that sell relay-less reverser modules. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to - An online railroad bookstore featuring a curated selection of new and used railroad books. Railroad pictorials, railroad history, steam locomotives, passenger trains, modern railroading. Hundreds of titles available, most at discount prices! We also have a video and children's book section. - An online model railroad bookstore featuring a curated selection of new and used books. Layout design, track plans, scenery and structure building, wiring, DCC, Tinplate, Toy Trains, Price Guides and more.