Snowpiercer

Snowpiercer is a story about a self sufficient super train that becomes the last survivable place on Earth for humanity.

With global warming going out of control scientists develop a strategy for reversing the warming effect, but something goes wrong and the effect goes out of control deep freezing the world and killing anyone.except the people on the train.  People on the train are divided by class with the lowest at the rear of the train. The low class people live in squallier. Conditions worsen and one man decides to act to help his people by leading them in rebellion.