Survivors of Earth's second Ice Age live out their days on a luxury train that ploughs through snow and ice. The train's poorest residents, who live in the squalid caboose, plan to improve their lot by taking over the engine room. I found out this was taken from a graphic novel series but it makes it as a 2 hour movie. It has a steampunk look to it which supports it's apocalyptic, techno-suicidal theme. The idea seams ridiculous but it's just a prop for the action-filled plot which is copied in other movies (World War Z, Mortal Engines, etc.) Remarkable acting by Chris Evans and certainly, Tilda Swinden who's alway good. The metaphor is obvious: humanity's downfall amidst the technology which fails to save them. Having seen that in awhile ... like just last week ... five times. Good action movie if you like dark themes and over-the-top characters.