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Lenz and Roco both offer switchers fitted with DCC function-controlled uncoupling, both are European locos though with the standard loop couplers. The problem with knuckles seems to be that the whole coupler pocket needs to move up and down to couple/uncouple, at least one the models I've seen. The Euro locos either have just the "hook" which is lowered to uncouple (Lenz) or a set of jaws that form the "loop" when closed (Roco). <br /> <br />The Roco switcher is actually very prototypical, the DB (German railways) have had some yard switchers fitted with auto-uncoupling in real life now, they have a yellow tubelike structure that covers the coupling hook on the car and presumably has a small metal bar inside to lock onto the hook. The whole switching job only needs one person, often driving the loco from one end walkway using a radio handset.
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