[bostik]

London is particularly bad, and one reason is the insane increase for demand in commuting capacity.

I can't find the source, but in 2010 or so, there were about 250k people traveling to London daily for their work. (That figure was 350k in early 2013.) In 2019, there are something like 850k people doing the same.

Even if the numbers were only vaguely there, that still means >200% increase in required commuting capacity in a decade. Don't know if any transport infrastructure could support that kind of expansion.