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The Tokyo subway system, mostly built in the 1960s and 1970s, remains one of the most efficient and convenient transportation solutions you'll find anywhere -- not to mention the insane scale at which it operates.
Building it was an extremely smart investment in the future, that has paid for itself countless times over via the economic growth it has unlocked & the social benefits it has delivered. Large-scale, convenient, efficient public transportation (combined with dense cities) is 
Precipitation Radar (DPR), one of the world’s most advanced meteorological instruments, developed by the #Japan Aerospace Exploration Agency (JAXA). By emitting radio waves in two different frequencies, DPR can measure the distribution of rain in 3D.https://www.japan.go.jp/regions/resilientjapan/flood.html …
Interesting..
Except it's run by 2 different companies. 
Barely affects you as a commuter though since you can use the suica/pasmo card on both JR and Toei anyway Tho pasmo is more a e s t h e t i c
Moscow/Kiev is the winner
Mold could have done it. This is one of the examples I think of when I think of biological computing:https://www.discovermagazine.com/planet-earth/brainless-slime-mold-builds-a-replica-tokyo-subway …
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