[bell-cot]

+1, and "Implied legal (and moral) liabilities" is just one of the issues if you're viewing the Trolley Problem as a real-world, real-consequences situation. (Vs. something from the land of make-believe, which is cool / interesting / empowering to sit around & talk about.)

For starters, real-world railroad (RR) switches are more complex than what you would understand from model RR sets, cartoons, old movies, and philosophy books. They are not binary, are often less than well-maintained, and may required upper-body strength that you don't have to successfully throw. The trolley may be going too fast for the track that you divert it onto, resulting in a derailment that kills everybody you were looking at - plus some more inside the trolley. Plus extra bystanders. Your well-intentioned passerby's understanding of which way the switch is actually pointing may be wrong. RR history has some famous (& deadly) accidents where an experienced RR employee misunderstood the situation, and threw a switch the wrong way.

Real-world, I certainly would not be touching the switch.