Snowpiercer (2013) on Netflix

The nations release the substance CW-7 with the intention of controlling the global warning, but accidentally it results in another Ice Age destroying Earth. The only survivors live in the train Snowpiercer which is driven by a perpetual motion engine created by the millionaire Wilford that lives in the engine part. In 2031, after seventeen years, there is a fight of classes inside the train since the oppressed lower class lives in dreadful conditions in the last wagons of the train while the elite lives in the front wagons. The lower class is fed with protein bars only; they are oppressed and punished by Minister Mason and her brutal guards; and their children are taken every now and then when they reach a certain height. The leaders Gilliam, Curtis Everett and Edgar are plotting a scheme to reach the engine and talk to Wilford about their conditions using the addicted security engineer Namgoong Minsoo and his clairvoyant daughter Yona that are imprisoned to open the locked doors. When the son of Tanya, Timmy, is captured by Mason, they decide to execute their plan. There are many casualties and soon Curtis discovers that they have been manipulated by Wilford to balance the resources in the train, and why the magnate keeps the lower class alive.