Check out London's new underground rail line (just don't call it the Underground)

Technically, the Elizabeth Line is but the first part of Crossrail, an expansion of the city's rail system so sprawling and expensive that it is most certainly it's own thing, not part of the London Underground. But even Transport For London's Chief Operating Officer Andy Lord can't deny it without laughing. It runs, after all, under London.

"It's shiny, silver and purple," says reporter Geoff Marshall.