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Sometimes, rude conductors force people to give up their seats (Muscovites are groaning now because they've forgotten what a conductor is). There's nothing you can do about it. Unless, of course, you put on your headphones and stare out the window with a deeply indifferent expression; the chance that someone will ask you to give up your seat is less.
We do have controllers, there aren't many of them, but they exist. Especially around 11 a.m., you might run into one.