After making your choice, if Monty offers to throw away whichever of the remaining two he knows isn’t the winner and trade you the other one, always do it.
On second thought I would say do nothing, because you didn’t create this situation and don’t even know if it’s sincere. The trolley might be set to break down no matter what you do. Or possibly everybody tied to the track is an actor. Or the whole thing is wired to explode and kill everyone. Taking any action at all is cooperating with whoever set the whole thing up, thereby making you their accomplice.
After making your choice, if Monty offers to throw away whichever of the remaining two he knows isn’t the winner and trade you the other one, always do it.
On second thought I would say do nothing, because you didn’t create this situation and don’t even know if it’s sincere. The trolley might be set to break down no matter what you do. Or possibly everybody tied to the track is an actor. Or the whole thing is wired to explode and kill everyone. Taking any action at all is cooperating with whoever set the whole thing up, thereby making you their accomplice.