Well in modern stations when a train arrives at terminal and has to revert they attach a locomotive on the other end of the train. So there should be something showing a new locomotive approching and starting dragging the train in the opposite direction.
I don’t know if it’s possible.
It’s also true that most highspeed trains today are “standalone” so they can revert their direction at any moment.
I hope the devs will tell us more about this.