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The simplest way to do it is to get stationary decoders to run the switch machines and control them from the Digitrax , and toss the DPDTs completely. But that can get a bit expensive, especially if you have a lot of powered switch machines, and you'll probably also need at least one DCC power booster. The DCC wiring is AC, not DC, and I'm not sure if the Tortoise machines can use AC. If they can, then you can just run the power off the DCC power bus to the DPDTs. As you said, though, you'll probably need to add a booster, since the Zephyr's power output may not be enough to run all the switch machines and a couple of locos at the same time, especially if you have the Tortoise machines wired to "stall" and still draw power. If they need a DC power source, then your only alternative to going all-DCC for the switches is a separate power supply and power bus for the switches.
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