Given that the exact same question is the current top post but for driving instead of transit, I feel this question was needed.
My answer: I saw some guys hooking up a Raclette Grill to the outlet in an otherwise empty German intercity rail waggon. They had it unpacked in one of these 4 person seats with a small table. No idea if that could work or if draws too much power from the board net. I just headed on to the next waggon.
I did not expect the sheer amount of posts from Americans about mentally ill people or drug users. I taught this would get more vibes, like people moving weird furniture in trams, or people in weird costumes, or stuff like that.