Those are the Asian cities I visited, lucky me, and I can prove it: you’ll find photo sets at: Tokyo: https://www.flickr.com/photos/36217981@N02/sets/72157642352812245/ Seoul: https://www.flickr.com/photos/36217981@N02/sets/72157642390067303/ Shanghai: https://www.flickr.com/photos/36217981@N02/sets/72157642406170383/ Fellow transit aficionados will recognize these burgs as home to some of the world’s most formidable metro networks, by system length and annual passenger rides. I spent much of the last decade telling…