The Shinkansen is FASCINATING. I recently went and was amazed by Tokyo's infrastructure and how they have a city under a city. The fact that there is a bullet train at tokyo station every 10 mins or so is mind blowing

I went into a Youtube rabbit hole the other night...

https://www.youtube.com/watch?v=HdJwAUdvlik

https://www.youtube.com/watch?v=FFpG3yf3Rxk