So many dumb people. Spoilers I never review movies, I'm actually reviewing the reviews.
If you see a low score in the reviews and 20 plot holes, they are from super super dumb morons who look at movies from only one view, their dummy view.
This is a very simple societal critique that uses very obvious metaphors: train on a loop that lasts exactly a year, class systems, deities and worship, population control, inequality, unequal distribution of wealth, megalomania, rebellion, false hope, manipulation, elitism, poverty.
"The train is stupid, how does it work blah blah blah" - this is not an apocalypse movie nor a documentary. This is a movie about society. The train is society, humanity, history, repetition, power, control, governments.
It's really not hard.
I scored the movie 8 because the movie themes were actually TOO obvious and literal. Obviously not literal enough for the dummies that reviewed it.
Summary: it's a faux apocalypse movie dealing with the themes of humanity, existence, society, power, and wealth. It's not actually about a train and how the train mechanically works.