Tokyo’s cavernous train stations seem to be permanent construction zones. There is always some part or another shrouded in white sheets and skirted by a maze of endlessly shifting temporary paths. Walk the bowels of these stations long enough and you may come across Shuetsu Sato 佐藤修悦. Sixty-five year old Sato san wears a crisp canary yellow uniform, reflective vest and polished white helmet. His j