When a natural disaster strikes in the apocalypse, the protagonist takes refuge in a high-speed railway and builds it into his doomsday home. No system, no time travel, no specificity. Survival in the end of the world depends entirely on personal ability. The protagonist lived happily day after day in the company of Bai Jie, Cang Cang and other girls. Being able to understand the introduction proves that you are experienced.
