Correction: transmitting the track signal to the cab is how high-speed trains worked half a century ago. That's SOP on most modern trains by now, with high-spee

Correction: transmitting the track signal to the cab is how high-speed trains worked half a century ago. That's SOP on most modern trains by now, with high-speed rail using moving blocks now (no more physical signals at predefined distances, control system negotiates the safe distance for each train, based on realtime data).