Pull it -1/12 of the way, causing the infinity to converge to a real number.

I quickly carry the people to the other side so they all can get run over.

I actually would like to choose the track where the number of people increases by one (so 1, 2, 3, 4...) and then the train will kill -1/12 people

PS Yes, I know this sum result is problematic, it's only a joke

build new tracks to make the trolley run on (possibly in circles).

I would take a sledgehammer and smash the trolley to bits, thus solving the problem and saving infinite number of lives. There's always another option available.

Slip the switch, like always

The existence of the bottom track would imply an infinite density of people, which would create a black hole and kill everyone involved, regardless of the trolley's presence

Do nothing - maximum destruction

The same thing most people would do when presented with a Trolly Problem for real. Analysis paralysis, choose to do nothing, then cry softly every night for the rest of my life.

I have a tangential question I have been wanted an explanation for:

If there are infinite universes, would there be infinite earth's?

I remember (an) answer is infinite universes doesn't necessarily mean infinite earth's. A cool analogy of a CD rack was used when I read it, but I can't find it. Does anyone else have an explanation and/or analogy for this?

Since there's an infinite number of people to kill in either case I can just do nothing, and thus by inaction most of those infinite people will have more than enough time for someone else to rescue them. Maybe the State, that's what they're there for.

Probably pull the leaver cuz then I can jump in front of the train.