I use the DG couplings on my passenger stock on my terminus layout. It gives me 'invisible' coupling and uncoupling of the coach rakes without having to find the magnet to shuffle over.
With just the hooks and latches fitted to locos and the loops on the first and last coaches, I have one magnet* buried between the sleepers at the entrance to each platform and five to create a short magnetic zone just over a loco's length from the stops, this allows for different length locos.
A train entering the platform runs over the first magnet and with the coupling under tension nothing happens. The train then pulls up at the stops. As the coupling is in the magnetic zone the loco sets back enough to release tension and uncouples. The pilot loco draws up to the end coach and couples up then sets back out of the platform running over the magnet at the end of the platform with the coupling under tension.
The pilot loco then propels the coaches into the departure platform, or carriage siding, and when the loco coupling runs over the magnet at the entrance it goes into delay mode without having to stop and do a shuffle and the loco can then spot the coaches and reverse back out to the pilot siding.
The train engine having turned, or a new loco, sets back onto the train, couples up and departs.
I have no goods at the moment but will have. I think electromagnets will have to be utilised for selective uncoupling and some thought put into their placement.
*Magnets are 3x6 mm neodymium rods