It does need to be borne in mind that the UK's railway infrastructure is already running at near or full capacity, and would need to be completely overhauled if extra capacity was to be created.
A lot of people, including politicians and the media, seem to have forgotten that one of the main drivers behind the original thinking about HS2 was that by diverting the higher speed inter-city trains onto their own dedicated tracks, it would free up much needed space on existing lines to run slower commuter type trains plus extra freight trains.
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