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.
Saw someone poop off the red line train in chicago. Impressive considering he did it in the brief time the doors were open.
As shocking as it was to see, it’s far less detrimental to my mental health than the existence of a highway and the omnipresence of cars.