However, this is a complete paradigm shift in the way of travel. This would have made Birmingham a suburb of London, as you can just go to the train station and hop on the next train as you do if you were to travel from anywhere within London.
The newspapers kept reporting the "faster" travel times which only shaves off "a few minutes" for a huge amount of money. But that was not the point. The point was capacity through frequency.
Over the years, this has been watered down. Now still a huge amount of money is spent on property buyouts and nature preservation / protection (the same higher frequency trains would have needed as well), on a marginally better service.
It seems to me (maybe thats wrong) that a lot of the fancy tech that is needed for increasing frequency could be had at relatively low extra cost, because there is this high base budget that needs to be spent whatever the performance of this new rail-line. So now HS2 is the worst of both worlds: expensive works delivering only a small improvement.
[0]: https://assets.publishing.service.gov.uk/media/5a82b56740f0b...