K
Kitty Sinatra
Given that this is a lab experiment, the scientist placing you in this position is guilty of 1st degree murder (either 5 counts or 1 depending on your choice), since he set up this whole fucking scenario, and you're just another victim. Hell, I think he'd probably get a kidnapping charge for abducting you, and there's probably some weird Wild West era law prohibiting the use of railroads in experiments that would have the scientist swinging from a tree even if you find a way to save everyone.