For something like a train I would think you'd want one or more humans babysitting it all the time no matter how automated it is. Thousands of people would ride

For something like a train I would think you'd want one or more humans babysitting it all the time no matter how automated it is. Thousands of people would ride it every day, all the time, even if it is 100% automated what would be the point in cutting that particular corner? Saving labor costs on conductors are probably not worth it for insurance reasons alone, even if the conductor sits around twiddling his thumbs all day long.