Here we go with the Docklands Light Railway DLR network and my totally unofficial interpretation of the system. I assigned each service an alphanumeric identifier breaking with London tradition of unnumbered railway
DLR - Transport for London
TfL Launches New DLR Map To Mark 30th Anniversary | Londonist
Docklands Light Railway - Wikipedia
South London Tube Map 2050, Including all TFL project proposals: South London Metronisation, Sutton Tram, DLR/ Bakerloo Line extension, ect. : r/LondonUnderground
Docklands Light Railway: What exactly is a 'light railway' on the London Underground map - MyLondon
The new London tube map (August 2011 version)
Map; DLR route map, published by Docklands Light Railway, 2000 | London Transport Museum
The DLR gets a new map - each route now separated by colour - Murky Depths
Map; DLR route map, published by Docklands Light Railway, 2000 | London Transport Museum
London Underground : Tube Map - Apps on Google Play
Tube Map June 2010 | The DLR Stratford International and ELR… | Sparkyscrum | Flickr