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Their wordsIn truth, rather rapid electrification projects, without decade-by-decade continuity, exist outside the UK and are often quite reasonable in their costs, as in Denmark, Israel, and especially India.
Their wordsWell, PRC HSR construction costs relative to the amount of tunneling aren't particularly low. France's are lower; Germany's are inconsistent, depending on whether money is wasted on excessive tunneling or on other things.
Their wordsStandardized systems are important, and there is a systems premium in the US and UK, but it can't be about a regular pipeline because London has that and yet Crossrail engaged in some really dodgy systems decisions that drove costs up.
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