Doomsday Mechanic: I Build a Global Train Fortress

The sun stopped rising. Cities plunged into eternal polar night, infested by starving zombies and indescribable horrors birthed from towering Evil God corpses. Humanity scattered, desperate, but Lin Xian, a lone prepper, refused to wait for death. His solution? To build his own salvation. Armed with the \"Mechanical Heart,\" an ability to devour machines for raw power, skills, and blueprints, he began the impossible: constructing a colossal, armored train. His \"Infinity\" would carry him across the planet's crumbling orbital tracks, a mobile fortress against the encroaching darkness. But when a mysterious girl with untold powers appears at his reinforced door, bringing with her a new wave of grotesque horrors, Lin Xian realizes his fortress is a target. Can his mechanical might outrun the true terrors of the Endless Night, or is the \"Infinity\" merely a coffin on rails?