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Pulling the Lever in a Subway Problem

Eleven years ago I was on the Red Line (not the section that's a trolley), and found myself in a variant of the classic moral dilemma. I wrote about it on Reddit at the time: Hi! I'm the person who pulled the brake. What I saw: The train starts pulling out of the station. Someone begins shouting that their arm is caught in the door. I look over, see that the door is closed somewhere between t

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