After all the tinkering and continuous accumulation, it's turned into what it is now.
Just the locomotive alone has hundreds of different systems; take the "communications" system for example, it's split into internal and external: internally there's whole-train broadcasting, personal communicator positioning, combat communications, sound monitoring, and so on.
Externally there's ultra-long-distance communications, directional amplification, whistles, environmental sound management, strategic sound projection, and so on.
Behind each item lies the sweat and wisdom of more than five thousand flight attendants.
These functions might look very ordinary, nothing high-tech about them, but all these basic features piled together make for an almost invincible Armed Train.
Practical and useful is far more important than some damned sense of high-tech.
