Orbital Age

With the advent of all-out nuclear war, the once-splendid human civilization was eventually destroyed in the flames of several wars and all-out mechanical rebellion. But as time changed, the humans who survived underground eventually flourished. After a long era of reconstruction, people stood at the top of the world again, but this time their homes were no longer livable, and they no longer lived in cities and farms. Instead, they had stations one after another, and tracks one after another, turning all the original cities into high walls, highways, and underground networks. The era of orbit has arrived, and everyone can only move in one direction.