Why not create autonomous A-B trains. A train that will take a smaller number of cars ONLY between point A and B. Then at each end offload to a truck. Not the

Why not create autonomous A-B trains. A train that will take a smaller number of cars ONLY between point A and B. Then at each end offload to a truck. Not the same as current rail frieght, I am saying a dedicated track between say port of oakland and port of long beach - with some intermediary way points along the way - it just has two lines - there, and back with a dedicated automated train that simply goes back and forth - with gantry ports the train drives beneath at certain locations to lift off cars quickly for that node. We have done a poor job of leveraging rail in a future-proof manner...