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 once had a guy walk into the subway, sit down, loudly declare he’d sneak into a military base, steal a tank and kill us all, then rant for a while about specific ways to kill his fellow passengers, including some very specific grenade action.
Then he sat there in silence for a couple of minutes, quietly turned towards the too-horrified-to-change-seats nerdy guy to his left and politely ask him if he had a lighter for his cigarrette.
It was a morning train, most people just kept trying to nap.