"I have seen on this forum someone mentioned magnetic jewelry catches"
I remember that topic. I may have even had a hand in it's discussion. I wonder if anyone here has actually tried that method.
Hook and loops are wonderful for continuous fail-safe running. And they're not too bad for shunting operations. I've made a manual un-coupler with a piece of ridged wire with a piece of sheet metal soldered to it's end. I slip it down between the loops and gently give it a twist. The cars separate just enough so that when I pull the loco away, I actually leave some wagons on the siding. That is of course if I remember to change direction on my transmitter.
I am getting off topic here. I apologize. A few years ago I bought some of this guys stuff. It is very nice for the price, and lends itself well to bashing.