Remote uncoupling is difficult to achieve in LEGO. This (poor quality) video shows how Kadee couplers are a possible solution. The couplers have been attached without modification to themselves or to any LEGO parts. The uncoupling magnets are standard LEGO magnets.
The video shows coupling, then uncoupling, and finally delayed uncoupling.
- web.archive.org/web/20021022131635/http://www.ozbricks.co.... As far as I know this is the first example of using Kadee couplers with LEGO trains.
- www.eurobricks.com/forum/index.php?showtopic=41262. Describes the use of Kadee couplers on LEGO trains. Includes links to LUGNET discussions on the topic, and legoboy3998 added instructions for installing Kadee #806 couplers on a 3 x 2 Plate with Hole (I used these to install my couplers).
- www.flickr.com/photos/14163824@N07/5705019592/ and www.flickr.com/photos/14163824@N07/5711044112/. Shows the use of Kadee couplers on LEGO trains, including an exploded view of parts required to install couplers on a 3 x 2 Plate with Hole.
- www.kadee.com/animation/c1.htm. Explains how Kadee couplers work.
***UPDATE: I've cleaned up and expanded this list in a discussion on LEGO Train MOCs. Please post general comments on the use of Kadee couplers there rather than here.