Chuck, the second relay is to supply track power, correctly phased, to the turnout frog depending on the position of the points. In a two rail layout there is no "common" rail because of reverse loops. Further up this set of posts I posted the wiring diagram for that second relay. I only have a few surface mount motors, most are Tortoise machines which are far simpler to monitor. They do not require the DZ1008 relay and the extra 5VDC supply. We already had all the frog power supply relays so we used them rather than try to make do with just the DZ1008 for the surface mounts.
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