On March 15, 2013, the Shibuya Station Toyoko Line above-ground train quietly shut down for good, to be replaced with a new section of subway track connecting Shibuya Station and the nearby Daikanyama Station. Converting the line from above-ground to underground was a massive operation, requiring a grand total of 1,200 engineers and countless man-hours.
But, even if you’d been living in Tokyo at the time, you probably wouldn’t have noticed the construction, because it all occurred during the train line’s off-hours… over the course of one single night.