No one knows what kind of time-space technology is used by the Celestial Wings Space-Time train.
It's like magic; you blink your eyes, the door opens, and you can reach any corner of the world.
Even the poles of the world, the darkest and most silent seabed, or even inside a volcanic eruption!
Of course, most people wouldn't do such a life-threateningly stupid thing.
This train usually only travels between Nest Cities, and it's the only means of transport between them.
There is very little interaction between the Nest Cities, especially for remote and undeveloped ones like Corrupt Nest City.
It's almost impossible to reach other Nest Cities using ordinary means of transport like private cars, trains, or planes.
Each Nest City is separated by hundreds of thousands, or even millions of kilometers, like two entirely different worlds.
