An interesting opinion saying self-driving cars will make passenger rail obsolete and I tend to agree. I think passenger rail is a short-sighted investment. We've already invested heavily into road infrastructure in North America.
https://ieeexplore.ieee.org/stamp/st...number=8733934
Imagine a "train" of self-driving cars all communicating with each other in real-time. They could drive at much higher speeds and much closer together. If a moose crossed the road the car at the front would brake, but the cars behind it in the train would also all brake at the same time.