Single-track railroad like in airport terminal-to-terminal transport? Fine.

Out on the open rail network? Not even close. And that is a LOT more constrained & predictable than an open road network.

Getting to all cars being software-driven seems as much in the near-mid future as was the idea of having full vehicle-to-vehicle telemetry &communications - i.e., sounded like a great idea until it crashed on the rocks of practicality (and inter-corporate politics?); not likely happening in a relevant time frame.