My V60 (37861) has this function. I'm still quite a newbie with Marklin but this is what I've discovered about this function.

When this function is activated from my MS2, the engine sound increases and the lok slowly backs up a few millimetres to slacken the coupler tension between itself and the wagon. The engine noise returns to tickover and the Telex coupler disengages with the accompanying "clunking" sounds. The loco then revs up again and moves forward a couple of centimetres leaving its train behind. You can then take normal control and move the loco off to its next job.

I still haven't found a permanent home for my layout yet so I have to operate it as a carpetbahn when the spare bedroom is free. Since I discovered this neat feature, I spend most of my operating sessions shunting and making up new freight consists rather than watching my passenger trains chasing their tail round and round.

Such fun!

I think that must be an error on Marklin's web page. As you say, the product overview for 39422 does list "Switching Manoeuvre" as a function. However, the Manual lists it at F16 labelling it as "Low Speed Switching Range".

So, no automated "coupling dance" routine available for the Re 4/4, just a limited acceleration and speed range option.

Thanks Jean

Whilst I agree with your response about the "coupler dance" on the V60 which also features on the later 39690 which has the "new" telex coupler - I have considered buying one that was not what my original post was about.

On the Marklin website many of the currently available loks list a feature called Switching Manoeuvre I gave one example above. They repeat it on the list of digital functions but when you get to the manual it is difficult to determine which function if any fits the description of switching manoeuvre if I knew what that was. That was my question.