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Just walk away and assume the original engineer put safety measures in place.
If you pull the lever after the trolley's first set of wheels has passed the switch but before its last set of wheels has passed the switch then you'll derail the trolley and everyone lives.
Except the guy in the trolley
He should have been wearing his seatbelt. That's on him.
Also, why wasn't he pulling the emergency brake? He deserves it.
The group of kids on a school trip in the trolley.
That's also another fun layer of metaphor to this whole thing. What's in the trolley? Nobody knows, and has to make decisions based on that incomplete information.
Yeah, not a bad answer! I’d assume someone is on the trolley too, but that’s just an assumption and, hey, maybe they would survive the wreck anyway!