An ASDO Beacon, Southampton, 12th September 2015

New to me.

ASDO (Automatic Selective Door Opening) passive device to manage door opening if train is in non-optimal position at the platform. The Hima Sella Tracklink III system.

http://www.railengineer.uk/2013/04/12/being-selective/

http://www.firstgreatwestern.info/coffeeshop/index.php?PHPSESSID=m7l073jpt94bbc9c0e2sr7v4c4&topic=12175.0;wap2

http://www.hima-sella.co.uk/rail-systems/tracklink-solutions