Wikipedia:Articles for deletion/List of world's most expensive transport infrastructure
There's plenty of coverage out there about such large projects - see https://books.google.co.uk/books?id=iH0tAgAAQBAJ&pg=PA333 International Handbook on Mega-Projects, for example.  We also have a more general list of megaprojects and it seems quite reasonable to have a sublist for transport projects such as Crossrail.  The main issue I'm seeing is that the costs should be normalised to adjust for inflation.  Such improvements, renaming, scoping, &c are best done by ordinary editing per our |policy.  Deletion is not appropriate because it would be |disruptive
— user:Andrew, 12:48, 6 March 2015 (UTC)
Stance: keep
Cited policy: WP:IMPERFECT||WP:DISRUPTION (Wikipedia:Editing policy)