Holy shit. If I understand correctly, the trains were programmed to use their GPS sensors to detect if they were ever physically moved to an independent repair shop. If they detected that they were at an independent repair shop, they were programmed to lock themselves and give strange and nonsensical error codes. Typing in an unlock code at the engineer’s console would allow the trains to start working normally again.
If there were a corporation-sized mirror, I don’t know how NEWAG could look at itself in it.