Snowpiercer (2014)

After a failed experiment to stop global warming, a new ice age destroys most life on the planet. The only human survivors are the inhabitants of the Snowpiercer, a vast train traveling around the globe, powered by a sacred perpetual-motion engine. A rigid class system evolves on the train, with the poorest and hungriest imprisoned in the rear cars while others prosper and indulge at the front, but a revolution brews.