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If I understand the problem correctly. Trains enter the passing track from the westbound inbound track, and then leave via the westbound outbound track. Or. Trains enter from the Eastbound inbound track and then exit via the Eastbound outbound track. So if you have on switch control point that selects either entry and exit from the westbound track . OR entry and exit from the eastbound tracks. Then, you could use a Double pole (DPDT) contacts on the switch machines that controls the route, the common input is to the passing track and the other contacts are connected to the corresponding alternative routes. This should would for both DCC and DC. With the DCC, both eastbound and westbound are from the same source and this would be a simple reversing wiring to the DPDT. <br /> <br />The end result would be that you use your DPDT switch idea. But move the DPDT to the switch contacts on either end of the passing track. Wire the control for the two switches in parallel so that the switches always work together, and there you go.
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