I've put them in a couple. Probably the cheapest method is a tether from the main locomotive and a relay to switch track power so you don't overload the R2LC triac. You can also just use a little steam motherboard and an R2LC in the dummy, that allows you to dispense with the tether. For a dummy A-unit, that also gives you directional lights and couplers. If it floats your boat, you can add sound to the dummy unit too.
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