Please note that this should be (yet another) debate about North vs South (there's plenty of them).
Yes there's an argument (and I am happy to support it) that in general there's a need for more investment across the country and not just in and around London. However please note that such investment doesn't necessarily mean infrastructure investment, as a lot of capacity improvements can be made with fairly small infrastructure costs in some locations. However to make an impact in London, almost certainly means new lines rather than platform extensions, chances to signals and a few loops/restoration of extra tracks. The latter are often a lot cheaper than a new line, especially one which is likely to need to be placed in a long tunnel with stations within the tunnel.
As such should there be investment to significantly improve rail capacity around the whole country?
Yes, most definitely.
Would that mean an equal (however you define equal as) amount of money being spent across the country?
No, most certainly not.
As £30bn in London would get you a train line which is busy and paying it's way whilst just £3bn on infrastructure in another region elsewhere could result in fairly quiet trains sand extra subsidy needed. However invest £3bn in that same region, with a good chunk of it on new rolling stock and station improvements (money which isn't directly spent by government and so doesn't show up on the spending by the government) and the return would be a lot better and provide nearly as much of a capacity improvement, just much more spread out (which could benefit more people).
Yes there's an argument (and I am happy to support it) that in general there's a need for more investment across the country and not just in and around London. However please note that such investment doesn't necessarily mean infrastructure investment, as a lot of capacity improvements can be made with fairly small infrastructure costs in some locations. However to make an impact in London, almost certainly means new lines rather than platform extensions, chances to signals and a few loops/restoration of extra tracks. The latter are often a lot cheaper than a new line, especially one which is likely to need to be placed in a long tunnel with stations within the tunnel.
As such should there be investment to significantly improve rail capacity around the whole country?
Yes, most definitely.
Would that mean an equal (however you define equal as) amount of money being spent across the country?
No, most certainly not.
As £30bn in London would get you a train line which is busy and paying it's way whilst just £3bn on infrastructure in another region elsewhere could result in fairly quiet trains sand extra subsidy needed. However invest £3bn in that same region, with a good chunk of it on new rolling stock and station improvements (money which isn't directly spent by government and so doesn't show up on the spending by the government) and the return would be a lot better and provide nearly as much of a capacity improvement, just much more spread out (which could benefit more people).