On the train point, humans have operated fully automatic rail systems for nearly fifty years (the London Underground Victoria Line opened in 1968; BART in San Francisco is similarly automated and open in 1972). The first unattended train to my knowledge, the Vancouver SkyTrain, didn't open til 1985, or 17 years later.

My interpretation: it took a while—17 years—for people to warm up to driverless trains on fixed routes with no at-grade intersections.