What if the train magically transforms regular men into new men? What if they were opposed to the transformation before it happened?
Conversely, what about if it magically creates men causing potential overpopulation? What if the men it created morally oppose the tram, but more than half the local population feel like it is necessary to run no matter what?
You can pretty much run this thought experiment forever, so far we've been going for 57 years.