Do London Underground lines count?
I know the closest two on the underground network are Embankment and Charing Cross on the Northern Line, Theres a two minute walk between the two stations, Yet they still charge like £4 for a single ticket between the two.
Nope!!! It's Leicester Square to Covent Garden on the Piccadilly line. For the DLR try West India Quay to Canary Wharf DLR.