Ooooo----
Chugga chugga chugga!
The train quickly travelled through the darkness.
There was a large network of railways deep underground, constructed by the Starlight Empire in the past.
Gu Qing Shan understood the full extent of the Starlight Empire train's functions and structure.
While Su Xue Er knew the path forward thanks to her star chart.
The two of them worked with each other to pilot the train through the darkness, changing from track to track as they followed the instructions of the star chart.
A night quickly went by, the train continued to run tirelessly, but the two of them were already exhausted.
-------due to the restriction, everyone in the group had become ordinary people, so after about half a day of walking, the short struggle against a monster, as well as an entire night of piloting the train, they had been completely drained.