Some readers may think, through the text, why the urban scenes are sometimes a bit long. In fact, the city is the main body, and the one that crosses is the construction of the guard. The crossing is for the protagonist to become stronger and become a warrior of the apocalypse. What about the protagonist's poor relatives? Die? He protects alone? His responsibility is to protect the planet from being completely destroyed.

Therefore, the protagonist is in the city, and by chance develops a business empire. Then, his poor relatives and friends can have the money to buy the underground hope house. They, that wouldn't be the eighty or ninety percent of the people who were killed under the first round of doom.

Therefore, the city is the main body, and the crossing is just to make the protagonist stronger. The scene in the city is not long. Otherwise, he would be an immortal alone, and when the end came, his combat power would be transcendent, his friends would be dead, and there would be no acquaintances to chat with, so there would be no point in crossing.

Then, in a few chapters, the Snowpiercer train is about to start, and it's just a few days away.