For those who want that final bit of realism - take a look here.
(http://mrhmag.com/sites/model-railroad-hobbyist.com/files/users/joef/MRH%20MagnaLock%20N%20Brakelines%20584x800-03.jpg)
More details at http://www.pwrs.ca/announcements/view.php?ID=7837 (http://www.pwrs.ca/announcements/view.php?ID=7837)
product review at Review of self coupling air hoses for rolling stock & locomotives (http://www.youtube.com/watch?v=fv7AbCzuJmg#ws)
That's pretty cool.
Neat idea. Although, see how he had to pull both wagons apart to get them to unstick. With light UK outline wagons I think that these won't be any good for anyone using anything other than 'big hand in the sky' uncoupling because you'd end up just pulling the rest of the train along by the hose!