You need to brush up on what PTC is and what it does...
Because we cannot police civil servant behavior while driving, until such systems are implemented our freight and passenger systems cannot share the same lines safely.
I know what PTC is and what it does.
The Union Pacific crashes in Goodwell and Arkansas were freight trains only. There have been many passenger train collisions involving only passenger trains.
PTC is being implemented and mainlines will be 100% done by the end of next year.