so basically, after we f**ked up our climate to the point where y'know, global warming happens, scientists decide to use an experimental chemical to cool down the planet, CW-7. This ends up being too effective, and instead, freezes the planet, with the tempatures dropping to -40 and dropping like an anchor. A man named Mister Wilford (Owned of Wilford Industries) turns a luxury train into an ark, with the engine being powered by the surrounding snow, meaning that as long as it moves, it retains it's power. The rich, most responsible for how shitty the world is now, are allowed to buy tickets and board the train, however, the poor, which soon break onto the trainstation, occupate the back of the train as stowaways, now known as Tailies. The ticketed passangers divide into 3 classes, and the train is now travelling around the world, with no future or hope.