Well, as an industry insider, this sounds about right. Look at the delays and massive overspend that has occurred on the Great Western electrification - everything is grossly over-engineered to last for the 1000 year Reich! That's why the government has recently binned a lot of the planned work in favour of bi-mode trains. Perhaps the foundations for the masts are penetrating shallow workings?https://www.aditnow.co.uk/images/emoticons/wink.gif