Most Metros and trains look different in different countries. I like to take photos of them when I’m abroad because it’s part of the experience for me. Sure, the differences are small, but sometimes it’s all the more interesting when something works almost like it does at home but not exactly the same.

And then I think you underestimate the amount of people who photograph trains as a hobby. I think the German train photography subreddit regularly had posts in r/all.