Trains do not solve the same issue as Waymo/Rideshares/Taxis. For example, if I want to go from SF to somewhere in the East Bay, I would walk to my nearest bus stop, ride the bus to the train station, then hop on a train to Berkeley. But now I'm a couple miles from my friends' house. Relatively few people want to go to my friends' house each day, so it doesn't make sense to put a train station there. Maybe there should be a bus stop, but if everyone there owns cars anyway, the city might have other priorities. But I, the dude visiting, don't have a car. So I hire a cab/Uber/Waymo to bring me the last couple miles.