So you have just made them up? And you think that there will not only be unstaffed trains, but an unstaffed railway to? Whatever you have been smoking with Grant Shapps, I wouldn't book on for a safety-critical job with it.
Let's head back to GoA2, where a human remains in the front of a train (as per Victoria Line, Elizabeth Line, Thameslink etc.). In order to implement this you need ETCS. Do you seriously think that the entire UK network will be operating on ETCS in 10-15 years time? We still have many sections of Absolute Block which will still be in operation then, never mind the likes of Plymouth Panel which have no end date planned. Nationwide installation of ETCS will make HS2 look like a bargain.
Then let's consider GoA3, where a human is present on the train but their operational role is mostly limited to emergencies. Therefore there's no one looking out of the window ahead. In order to make this safe, you need the railway to be effectively secured from anything that may get in the path of a train. That means that the line must be properly fenced (P-Way regularly have to chase off sheep up here because the dry stone walls are falling down), trees have to be cut back so that they can't fall onto the line, and level crossing risk must be eliminated, including the closure or upgrade of all occupation and automatic level crossings. How much do you think this will cost to do?
GoA4. No human onboard at all. In the event of an emergency the passengers are on their own. In order to evacuate them safely without staff assistance you will need a catwalk along the length of the track, widening the formation where necessary. How much do you think that it will cost to expand the bore of our Victorian tunnels? You're probably coming close to doubling the national debt now. There is no way that labour savings are going to come close to paying for all of this.
And that's apart from the question of whether the public will accept hurtling along at 125mph with no human onboard, let alone one watching ahead. If cyber security experts have said that they wouldn't trust an unstaffed train, I certainly wouldn't either.