I'm sorry but at the moment the country needs plenty of investment in infrastructure. This is exactly the right time to accelerate putting the wires up.
The country has seen a massive boost in infrastructure investment in the last few years and will see more over the next 30 years - however, there is also a massive skills gap, in that companies can't find candidates able to do the job now, or of a sufficient aptitude to be trained to do the work we have now, let alone the increasingly larger order book. To push this further as you suggest is misguided and will not achieve a cost effective progression.
Whilst many people believe that throwing money at a problem can fix it, the reality is that the skills shortages are the defining factor. There is an enormous amount of electrification planned in the next 10 years, many feel that the current work load is not achievable.
I make my living from designing roads, the skills gap is also very evident there too, in that the ability of a local authority being able to design and build major projects as done before the 90's has gone through retirement and budget cuts, the industry has a reduced capability that is being filled to a degree by the private sector, who will invest in staff, but sadly the graduates with good enough appropriate degrees are a tad thin on the ground, similarly with trades, you need youngsters with a science and maths understanding to be able to work the equipment and understand what they are installing, sadly Pop Idol has made most youngsters aspire towards a career of being famous rather than building something....
The introduction of bi-mode trains reflects the ability of the industry to deliver the overhead equipment - i.e. not as fast as joe public would imagine.
