1,200 Japanese workers convert above-ground train to subway line in a matter of hours soranews24.com

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.
Building the incline required holding the tracks up on temporary scaffolding as the company dug out the earth below, which kind of makes us doubly glad the method held up.
Thanks to Tokyu’s incredible organization and the commendable teamwork of the engineers, the new section of track from Shibuya to Daikanyama was ready to roll overnight, giving us a renewed respect for Japanese engineering.