There are various "walking tube maps" that show you where it's quicker to walk between two stations:- http://rodcorp.typepad.com/rodcorp/images/tube_walklines_

There are various "walking tube maps" that show you where it's quicker to walk between two stations:- http://rodcorp.typepad.com/rodcorp/images/tube_walklines_final_lm.gif http://rodcorp.typepad.com/rodcorp/images/tube_walklines_fin...