There is a runaway trolley heading down the track, aiming directly for four workers who — because they all wear headphones against the noise — cannot hear the trolley’s approach. If the trolley hits the workers, it will kill them all. Assume they cannot hear you if you yell a warning, and they are too far away for you to run over and let them know what is about to happen. On an adjacent spur, however, there is only one worker. You happen to be standing next to the switch box. If you pull the switch, the trolley will be diverted and the four workers will be saved, while the one will die. If you do nothing, the four workers will die, but the one worker on the spur will be saved.
What ought one do here? In other words, what is the right course of action in this circumstance? Try to come up with an answer, along with an explanation of why you think the answer you supply is the right answer. That is, try to offer reasons that might convince one who was undecided but intent on learning what should be done.