North and West London Light Railway

The North and West London Light Railway (NWLLR), formerly proposed-named as Brent Cross Railway, is a potential light rail service proposed by the London group of the Campaign for Better Transport, intended to serve parts of north, northwest and west London, being similar to the Docklands Light Railway (DLR).[1] The proposal for a rapid transit network using existing or abandoned railway corridors was published in 2008.

More information on the Wikipedia page.