I picked up this picture on Flickr. The far tracks are the lines out of Marylebone. They are not electrified and there are no plans for electrification on this route, which runs only as far as Aylesbury.
At one time it was part of the Great Central and trains ran to Rugby, Leicester, Nottingham, Sheffield and Manchester. The route beyond Aylesbury is largely intact and could be reinstated at relatively little cost as a conventional railway to provide the additional capacity that HS2 advocates insist can be provided only by constructing a high speed line. They assure everyone that it would cost just a teeny-weeny bit more. That sounds implausible.
I got involved in a discussion with a Youtuber called “Philosophy all along”. This was in connection with criticism of Trump’s policy of deporting illegal migrants, which he argued would be bad for the economy as it would reduce demand. This implies that there is a need to import people to sustain demand. There is no obvious reason why a population should not be able to consume everything that the same population produces. If it can not, then something else is going on. It is a basic principle that wages are the least that workers will accept to do a job. Wages are a share of the value added by workers through their wages. The remainder is distributed as economic rent, after government has taken its cut in taxes. Monopoly profit is a temporary surplus that after a delay gets absorbed into economic rent. Land values in Silicon Valley are an example of this; it's like a gold rush. The miners get little out of it. Rent and tax syphon purchasing power away from those who produce the g...
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This then means that it is not able to be electrified (overhead) due to LU rules, so unless a new line was to be built to seperate the two routes (which isn't going to be cheap) the only other way to electrify the line would be to remove the LU services from the line (which isn't going to go down well).
Either way it is not going to be a case of just extneding the existing line.
Likewise, although repoening the Grand Central (GC) line would improve capacity over the Southern section, it could prove to be expensive to provide more capacity in the North.
It is however possible that the GC line will be reinstated bit by bit over time, as the East West will extent the existing Aylesbury services to run north to Milton Keynes.