I recently completed a remote uncoupler project on one of my LGB 2090 diesel locos. Nothing that required more than a basic miniature geared motor and an R/C module. It works fairly well, being able to release itself from a rake of cars most of the time in the garden setting. However, I came across this film of a remote uncoupler built by another modeler. What I was impressed with was his simple wire loop and hook arrangement. Both videos are linked below. You may draw your own conclusions. I won’t be offended if you choose his over mine.
First his version;
Now my creation;