Wasteland Train: from Cart to Star Sea

[National Cross-Travel Start] [Train Construction] [Two Male Protagonists] [Wasteland Development] [Mobile City] [Explore the World] [Interstellar Evolution] Everyone came to a strange world with only an old hand-cranked cart. Bai Jingyao and Gu Ci worked together to upgrade the train, gradually upgrading and exploring a larger world. After completing the path traveled by their predecessors, they discovered that the third-level area was just the starting point, and the two of them would face a completely unknown world alone. The setting is not broken, it is not toxic, it leans towards hard science fiction, it has a complete world view, and it can withstand scrutiny. [Note survivor bias throughout the text]