I’ve never seen any of them cause problems; they simply ride the trains all day.

Maybe this is dependent on country or region, because I see wildly different behavior between the unhoused in NYC and Manchester, in the UK, for example. In NYC, I’ve personally seen them pull a knife on random people, masturbating in the middle of the day on the train, two blind guys panhandling try to beat each other with their canes, each accusing the other of faking it to invade the other’s territory, smoking crack in the middle of crowded cars and plenty of other problematic behavior.

When I’ve been in Manchester, they’ve always been pretty reserved, just trying to do their own thing and get through the day without doing anything to draw unwanted attention to themselves. You wouldn’t even know a lot of them are there, unless you’re out after the shops close, and then there’s suddenly a bunch of people in sleeping bags in the doorways, just trying to sleep out of the wind and rain in a spot that might be marginally warmer.