Here's a few fun facts about Japan's trains:
- Every single station has a different song that plays. Here is a sampling of some: https://youtu.be/470_2wt2t1o
- In the deep subway stations they pump in bird sounds to make it not feel so deep
- The trains can be paid for with a specific card called the Suica card and/or pasmo card. This can also be used as a debit card at various shops. But recently due to the chip shortage these cards have been harder to get.