The same valuation is lacking with re-using skills while you have the chance. Obviously one cannot go round electrifying something just to keep the teams busy long term but the longer view needs to see how far into the future the next major electrification project is. Oh er, I've gone and said it !
The problem with construction is mobilisation, something rarely understood by clients/customers before you can actually start doing any work on the ground you first need to survey, design, price and procure the works realistically this is going to be a two to three year process.
So to achieve a constant workflow orders / approval to process for project B needs to be placed about 2 years ahead of project A reaching end of major works. GWML having long since pasted the major works completion point there would even if authorised tomorrow be a not insignificant period before any further work could be commenced and an associated skills gap.