Maybe I'm misunderstanding this statement, but between 2009 and 2022 London finished the 73 miles (118 km) long Crossrail Project (Elizabeth Line), with 26 miles (42 km) of new tunnel, 10 new stations, and 31 refurbished stations (some of which were entirely rebuilt).
https://www.theguardian.com/uk-news/2022/mar/13/elizabeth-line-crossrail-opening-london
https://web.archive.org/web/20180730181725/http://www.crossrail.co.uk/news/crossrail-in-numbers