With due respect, I don’t think you have considered the full potential of driverless cars.
125mph is very much achievable
My comments are from someone who is a rail enthusiast, you can’t beat a more convenient, safer, cheaper form of technology.
True driverless cars in UK towns are decades away; the current systems from Tesla etc are basically shams that barely cope with US-style gridiron towns. 125mph on a motorway is probably doable, but it would be horribly expensive on rubber tyres wide enough to safely corner at that sort of speed.
Going back on topic: a figure of £20b for "running the railways" was quoted way back on the first page. If we take out all the shareholder dividends, which are clearly money down the drain from a service point of view, how much do the companies actually
need in subsidies?
Public transport always suffers from static analysis of costs Vs income of the braindead sort Beeching did (although, to be fair to Beeching, he knew it was braindead and was just making sure he got the answer he was being paid for - he may have been a crook and liar, but he wasn't an idiot). The true value of the railways is in what they facilitate - the network effects of people being able to get to places. From the public (i.e., taxpayer) point of view, ticket sales are not nearly the whole story. For example: how much is it worth to a habitual car driver to have all the people on the railways not be on the road slowing him/her down? How about all the lorries that would replace the goods trains? No one is ever going to charge the car driver for that value, yet it's perfectly normal to hear people claim that if this bit of track or that station doesn't take in more cash-in-the-drawer than it costs to run, it should be closed down.
The very definition of "profit" is altered by putting the railways in the context of a national service supported by taxation. I suspect that in that context they have been profitable
to us at least since the 1980s and probably perpetually, but the artificial nature of the franchises hides that by artificially boosting the costs.