I have to suspend a lot of disbelief, but a few things are starting to bother me. So the rich get to be up front because they pay for it. But with what? The World is dead. There are not banks or hedge funds or off shore accounts, and even if they had bags of cash, what good is it without Countries to back the worth. looks like the true parasites, using up more than their share of the resources. (yeah, I know that is the point of the movie and the show). The show may address this more, but you would think the rest of the train would get this before 7 years. What are they doing for the train that Melanie can't open a door and boot them off. Leaving a better functioning train, better equipped to survive.
And did they really need Melanie to just reattach a loose coupling?