[crdb]

> You'd want to put them in kind of nondescript areas to avoid taking out the historic stuff as mentioned in the article and maybe pay out 50% above market to existing buildings in the way so they are not too pissed off but it could be doable.

Already exists, see e.g. Croydon. Yes, not in Zone 1, but 14 minutes to London Bridge by Thameslink, about the same time it took me to go from South Kensington to Westminster/St James in the early 2000s and probably without having to wait out a couple trains at rush hour due to lack of space within.