> That is completely false. PTC does that, and we've had it for several decades.

And they somehow work with radar, lidar and GPS from inside the train? No they work with classical block based systems and on signalboxes. So all the safety systems are outside of a train.

> You keep pretending that avoiding train collisions is too magical to achieve with current tech

Huh?? Railway interlocking exists for more than a century. It's very safe and I didn't wrote anything contradicting that.